I'm far from convinced we've actually missed out on anything much by Tarantino staying at bay from Bond. Would his version really looked so much different from DAD (perhaps with an added dose of Matrix and Bill)? I doubt it. And his comments on setting CR immediately after OHMSS don't sound that promising.
I think Tarantino was always more attracted by the surface of stories; it's mostly looks, style and effects over content with him. I'm sure he has had the images of a thousand fantastic scenes in mind when he pondered CR. But I'm also sure the actual story would have been buried under all those stylish eye candy. It's what the EON series has had enough of over the decades, a zillion iconic images with too little real story and content connecting them. The end of this road was DAD, from which point there was only the option to go and sample a series of teasers for two years, cut them with a score and sell the product as new Bond film. Or to break out of the concept and tell a story once more. Tarantino would have been the guy to go to for the sample plan. For EON's way, building up the series from scratch, I'm afraid he wouldn't have had enough patience, not enough explosions and saving-the-world stuff to keep him interested in the project.
And by the way, I also don't buy Tarantino wouldn't have grabbed the chance to get guaranteed headlines by dropping Brosnan and casting Craig ('Sorry, Pierce, nothing personal!
'). I bet he'd reveled in the scandal and public outcry. I'm just not sure he would have known how to use Craig's abilities once the headline potential has had worn off.
No, in the end I'm quite happy with the CR we've got.