It depends on what GT6 will be. GT5 is stretching the limits of the PS3 already, so don't expect radical changes for any sucessor on the PS3. If they want GT6 to be a radical improvement over GT5 (e.g. new or vastly improved engine), it will not be released on PS3. On the other hand, if GT6 will be GT5+ (e.g. engine largely identical, just different/enhanced content), it may very well be released on PS3.
This makes the most sense, so far. since we don't know what's in gt6 we can't make a guess as to will it need more performant hardware!
Kaz has said that with the constraints of the ps3 he couldn't go as far as he would have liked. Does this mean he's gone there and developed the engine and the codes been cut back for gt5? we don't know.
We do know that there is a possibility that a lot more content could be added to GT5 in the short time to prolong the game longevity.
Would this addition be considered to be worthy of the title GT6, or should we accept that this additional content is only sold or gifted as DLC for GT5.
Should They change the naming structure and depart from the past? Prologue had various versions, why not GT5, should it be named GT5, spec 2 , spec3 or GT6 GT7 GT8??
There's not enough evidence to suggest any of these things, we can dream and provide feedback on what we'd like to see in future GT games. where these align with PD and Sony we might get them.
Where the technical requirements are too high, well then we might have to wait for the next gen PS device.. but it's unlikely it's release will be driven by future GT requirements, given Sony are still selling more PS3's and folks are buying new PS3's to replace old PS3's.
I just don't see a compelling business case for the console update right now.. wheres the competition at a console level (ignore GT) With regards to future GT releases the lessons learned from working around technical limitations done on ps3 and psp may help on a future game and indeed a future platform. it depends on how compatible that platform is with todays platform. They might need to completely recode for PS4 who knows? another 6 years anyone
Enjoy what we have.👍