The difference to the YB series is that these were originally intended as the starter drug to Fleming's works. Their sole purpose was to get new readers and gently transport them into 007 country. They weren't intended to run on indefinitely.
I'm not sure that's true. At least I've never heard anyone -- publisher, author, or IFP -- say anything like that about the series. I think too many adult Bond fans think the sole purpose of the YB series was to tell the origin story of Fleming's Bond. The idea that it now must stop because continued adventures will strain the credibility of this origin is nonsense. James Bond is the king of strained credibility, and I really think you need to look at this series as it's own thing. I think the purpose of the YB series was to create a rousing stand alone YA action adventure series (tied into Fleming's Bond to be sure) that can indeed run indefinitely should there be the will to do so and fans who want it. I think the happy accident in all this is Charlie Higson has mixed the formula in such a way that he has truly conjured the spirit of Fleming, and that's one of the reasons this Bond fan wants it to continue.
Oh, but that's completely different
from what I understood the series to be about. I mean, of course the main reason is to earn a decent few quid and open a part of the market that was looking Bond films long before they understood what's happening between Bond and his female company underneath the sheets when Moore is contacted via Seiko in TSWLM. A part of the market that can and does enjoy the films for decades, without knowing or even caring about the books.
But, big but here, if that was the sole purpose, or even just the main one amongst others, getting the kids to read Bond instead of just watching him, then the by far safer way would have been to
not date the novels. Or at the very least
update them to Bond being born more recently. Zen, you and me are about the same age I suppose, and of course we know about history. But the younger readership has by far not the awareness about this history we take for granted. Transporting them to a period even before that war is in any event a risk. Not because kids wouldn't be able to understand, but because it's not sure from the start they'd
care about that period. I think I wouldn't have risked that move, had I been in any position to decide at IFP.
Another point that I think supports my impression is the limitation to five books. I know it's common practice today to give writers contracts over a number of books instead of buying every single one. Makes the whole business easier to calculate for all concerned parties. But there has been a limitation from the start and a rough outline where Bond would end up with the last instalment. Both these regulations cut down the number of options for IFP to push the button once more. Cut down, but I have to concede they don't close all the doors.
What closes (most of) them, and did so right from the start
in my view, is the apparent absence of a option on IFP's side to secure Higson's services for further entries. What I mean is, had I the intention to build up a stand alone series with the maximum number of possible sequels, then I'd certainly include such an option into the initial contract, wouldn't I? Even if it was just a trial balloon to test the waters, I'd be sure to let Charlie sign with a drop of blood.
Now, when did YB really take off? I suppose most of us would agree it was with 'Blood Fever'. That would have been the moment to rattle Higson's chain, at the latest after 'Double Or Die'. But
as far as we know, nothing of the sort has happened up to now. Had there been such an option I would have expected an announcement at the latest after the series' conclusion with 'By Royal Command'.
What happened
instead was Higson signing a new contract with Puffin and starting his own original series. Now, there can be any number of reasons for this. But it's also obvious YB isn't stuck with the first five books for lack of ideas on Charlies side. In fact he went on record only recently with promising ideas. The overall impression is, it's not Higson who stalls further adventures.
So if the reason is located not on his side this still doesn't necessarily mean IFP isn't interested in general. For example, it might (just
might; absolutely just guesswork on my side) be a question of the pricetag preventing a second series. This would be only natural, Higson has earned considerable standing with pulling YB. He would have every right to know and demand his price now.
But that wouldn't really prevent IFP from continuing their new venture, would it? Higson is hardly the only writer and it can't be impossible to find a talent able to step into the breach. If the emphasis (IFP's) was on cashing in, this would be just logical. But, once more to the best of our knowledge, nothing in this direction has happened.
My point is, if 'indefinitely' is (or was) a key factor of IFP's calculation with Young Bond, then I wonder why nothing really points in this direction IMHO and no apparent steps are taken. The way I read these facts indicates to me YB is overall a limited series by conception. It has a potential for further entries, but is in the end not designed to run on for an indefinite period of years/novels/spin-offs.
Just my 2 pennies...