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I'm not saying that it couldn't be fun in it's own way.
The question was "would you buy this?" My answer is "no, I would not." Simply put, Gran Turismo is for cars, and I would rather they focus on improving that aspect of it than jump the shark and include motorcycles.
Whether you like it or not, they're more than likely focusing on GT and TT already as it is; does it really matter to you what "form factor" the next TT arrives in? As already mentioned, Karts can't really be used with anything else (except by exploits), so the framework already exists to exclude certain types of vehicles - it could just be a new button on the main screen: GT Life, TT Life, Arcade (in which it might be possible to mix vehicles, I don't know / care) etc.
It just seems you're reacting based on some pre-supposed definition of what GT "is" and then trying to dress it with some semblance of validity based on concerns about the tricky control schema of two-wheeled vehicles. I suppose I should just say that it might help to think about the bigger picture on this.