You're right - 250 cars isn't a lot, in fact, it's insufficient for 7 years of development time. But we had around 200-250-ish premiums in GT5, plus ~15-25 DLC cars. Then GT6 updated some standards to Premium, and added ~125-ish cars, and there were a few freebies early on. So there's actually more like 400-ish total new (rather, premium) cars floating around in the GT universe right now.
Look at Forza 5, and in fact most other upcoming racing games for the next gen - I believe FM5 has only got 200 or so cars, some of which may have been carried over from AutoVista in FM4. PD has claimed (and this time actually proved) that their assets are being "future proofed" with adaptive tessellation and what not, so most new stuff in GT6 is actually next-gen ready. And they've been SUPER anal about their level of detail, which was already made apparent at the first peeks at GT5… so all this considered, *400-450 cars is quite good, one of the few things PD is doing quite well on.
I think GT7 will be able to have a reasonably decent car and track roster. We just need PD to do well on… Well, basically everything else existing or to-be existing in the game; bugs, AI calculation, career progression and design, sound, schedule-making, promise-keeping, communication, and most importantly, making a game that is exciting from the get-go, with enough content and features to keep you interested for a good many years, just as it was in the PS1/2 era.
I kid
