First and foremost, I want a well thought out and put together game, not a collection of features thrown into GT6 at the last minute. That means a comprehensive single player campaign not just a smattering of events that you have to do over and over and over and over again. The AI has to be a ton better. They can't give up when you are half-way overlapping them. PD has to decide what they want GT to be. Is it about having a sense of car ownership? If it is, I'm sorry but having to leave an online room just to get an oil change doesn't do it. Having to get oil changes for a thousand cars and watch some stupid animation doesn't do it. A car collection game mechanic is almost at odds with a car ownership game mechanic. The more cars you get the less attached you get to any one car. PD needs to decide what it wants to emphasize. The game that gave me the biggest sense of car ownership was Forza Horizons because I did most of the events in one or two cars not because I had to wash the cars or get oil changes.
Of course better physics is always important but I think we are limited because of GTs audience and PDs ability.