Well, you definitely have the right to your opinion. I must admit that I agree with the vast majority of people in thinking that 'Skyfall' is superior in practically every way to 'Quantum of Solace'. I could go into detail, but that's not what this thread is about and I know I'm not going to change anybody's mind!
The opinion of the majority, I feel, is part of the reason why 'Quantum' never saw a special edition release like that of 'Casino Royale'. I would guess that, although it did well at the box office, it didn't sell anywhere near as well as CR in its "initial" (and now only) home media release version. I initially purchased the QoS 2-disc DVD with the very anemic special features that all ended up on the Blu-ray release, then I bought the Blu-ray release when I was starting to get Blu-ray discs and now I only have the Bond 50 Blu-ray set. The Bond 50 set has its shortcomings (apart from the pointless bonus disc) so I still have the 'Die Another Day' DVD and the Special Edition Blu-ray of 'Casino Royale' which were to two releases that had the most bonus features overlooked in the 'Bond 50' set.
As for the topic of recent DVD releases not containing the special features of most Blu-ray releases, I would imagine it has to do with a few factors:
The first factor, which I doubt is the actual primary reason the trends are changing, is that Blu-ray discs have a much larger capacity and can have their content still look very good even after taking up some of the disc capacity with extras. Looking back at the Special Edition Bond releases, the video quality is greatly handicapped by the low bitrate made necessary by including HOURS of special features on those discs. I was much more pleased with the Ultimate Edition release (even without taking into account the remastering work that was done) and I'm sure the majority of people were not that annoyed that viewing the special features required swapping discs. The marketplace has moved to any DVD release with significant extras having all of the bonus features on a separate disc; this has been the case since just before Blu-ray hit the marketplace. Pressing an extra disc means roughly twice the disc-pressing expense for the studio and it seems like something they'd avoid if they could.
The primary factor I would imagine as to why DVDs tend to quite often be "barebones" lately is that, either through consumer trends or the wishes of movie studios, physical media is slowly being killed, or at least maimed. The studios view DVD as being outdated (which it is, especially age-wise for a home media format) and tend to see it as a medium for people who merely want to see a film to be able to do so.
Digital distribution seems to be becoming a much more prevalent means of release due to its convenience and DVD seems to be viewed as a format for those who either have trouble with streaming technology or those unable/unwilling to have a decent, stable enough internet connection to download films. The fact that a lot of people like to buy DVDs to have a physical copy of something in their collection doesn't seem to factor into the sales model anymore.
Blu-ray, on the other hand, is currently the most advanced physical home video medium available and, like DVD and LaserDisc in the past, has become the primary distribution medium for the bonus features to be most easily "neatly" packed along with the film. Another element that MUST factor in is that Blu-ray is currently seen as *the* home video/collectible crossover product: just take a look at all of the ridiculously gimmicky Blu-ray sets that are released every few weeks! I must admit that I have been sucked into that idea: I own the Marvel Phase One set that comes in silly plastic briefcase and I've been known to be a sucker for a lenticular cover in the past!
I'm sure I'm going to be frustrated when 4K Ultra HD Blu-ray has all of the special features exclusively on its discs, but for now it's been made clear: like it or not, Blu-ray is the way to go when one wants extra features with one's movies!