Besides improving AI PD also needs to setup all AI opponents to use competitive cars, having 1-2 AI cars that are considerably faster than every other AI car on the grid totally ruins the race.
Along with that, I wish PD would set up more serious racing events when you begin seeing race cars. In some of the earlier events, the field is a real hodge podge of lower classed race cars mixed in with all manner of sports cars. It's like some weird track day event.
In the I-A Class events which I've been racing a lot, the cars are more like what I'd expect to see in a real race. They still don't have all the cars they could within a certain performance and class, but in the Dream Car Championship I raced yesterday, there were four Touring Cars and the rest were LM class. Well, and the BMW V12 LMP, but it was a great race for me, seeing a bunch of cars that actually belonged together, like a two class race.
Especially now, with Kaz garnering this tie-in with FIA, I want to see races like that Dream Car thing, events you'd expect to see on TV in pro league racing. It means that PD has to provide more race cars in various classes and leagues, but in many cases, all they need are alternate liveries. I'm fine with fantasy liveries if they can't get a racing team licensed. In many cases they need more cars. We have a bunch of cars in GT6 that could stand to be race modded anyway. Tracks too, they do need more tracks, but some of those could be provided by upgrading more legacy tracks like Midfield and Red Rock Valley, which I want to see done anyway. Their fantasy tracks are very good.
And then of course, there's my dream mode for GT7, FIA GT Pro which I'd love to see take the form of a microcosm of motorsports, from grass roots to full racing leagues. If they could only manage to come up with one, two, three full leagues of cars and tracks to provide a nicely long mini-season of racing at the top of the tree, that would be fine. They could add leagues as licensing and modeling permitted.