I think the thing is, any franchise that disappoints its faithful only sees the drop in sales on the NEXT iteration. Most were pretty happy with GT4, and GT5p was widely seen as only a 'taster' of what GT5 was going to be (which is weird when you see just how DIFFERENT the final 'taste' actually was) but not the final arbiter. So GT5 sold like hotcakes.
But, unless Kaz is a man of his word, and does update GT5 to be the killer game it needs to be to live up to GT4, Sony won't see the hit until GT6 comes out.
We all rushed out and got GT5 expecting the logical successor to GT4. And got Pokeman instead. Kaz has a limited window to fix what is wrong, because there ARE what seems to be serious challenges coming, in FM4 and Shift 2 (and Shift 3, on the accelerated schedule that SMS seem to be able to make games at!) at the very least. And they will be out WAY, way before GT6 drops. So Kaz HAS to fix what most of us hate (
dislike, are mildly irritated at, insert your level of discomfort here) about GT5 in at least a reasonable time frame.
In my case, better AI and another 400 A-Spec races will restore my opinion of PD and Kaz's sanity, but B-Spec remote has me wondering if the have the wrong dosage on their meds...
It's truly quite weird to look at Shift 2 and FM4's announced feature sets, and realize 'OMG! That's EXACTLY what we all have been asking for!' while GT5 and Kaz continue to pretend they know NOTHING about them. If either (hopefully, BOTH) of these franchises get the physics part right, who is even going to BOTHER coming back for GT6?
If GT5 ISN'T turned into what we all want (and expected in the first place) pretty soon...