Id love a ps3 game if it would give us something totally new. To pay for a full game it needs to be alot better and not something that is doable with GT5 through a patch or add-on/dlc. Since GT5 is getting more support i think that games potential isn't finished and its still selling good.
This is being said time and time again, GT5 can just be patched but the fact of the matter is it hasn't been, not in the areas that matter. GT6 could be a great game on the PS3 without any extra horsepower.
Clichéd or not until Sony figure out a way to send an extra stick of 512mb RAM down on a internet update it will be very very difficult to find room for any more features or effects and until they can include a bigger graphics card on each disc the graphics will remain about the same.
So you will end up with GT5 plus some cars and tracks.
The RAM is a large issue, I'm not going to deny that. The shadows are likely to remain a bit blocky and the cars will remain at 16/12 but to me that's fine. The biggest problems with GT5 have nothing to do with the RAM. I had more fun and there was more to do on Gran Turismo 4 and the PS2 had 32Mb of RAM.
What GT6 needs above all else is content. More things to do, more events, more special events, more use of the licenses etc etc. The stuff GT4 and previous games had. You don't need better hardware for that, you just need better planning and time management.
I'm not saying this is going to happen because it's not for obvious reasons but theoretically this is what GT6 COULD contain, hypothetically speaking in terms of PS3 technology:
-1000 Premium cars
- 30+ unique tracks, all 'premium' and all with weather/time
- 200+ A-Spec events totaling 500+ individual races
- 50 special events covering all of the licenses and vehicles in GT5
- A livery editor
- Much more in depth car customistation, all cars can be made into race
- More mechanical car damage
- A-Spec and B-Spec mode integrated together, ability to race together
- More real world racing rules, qualifying before a race, multi class racing etc
- Better car sounds
- Improved AI
-
That's just off the top of my head, there is lots more.
I'll reiterate again, I'm not suggesting GT6 is going to contain all of that, it's not. I'm just highlighting that there is so much they COULD do the with the PS3. Even everything in that last to half the scale would be great.