I guess I've adopted the view that it is a completely different game, and hope that maybe the actual TOCA franchise will continue one day.
I view it as essentially playing PGR with touring cars and 20 cars on track (as far as that 1/3 of GRID is concerned anyway). The other 2 styles of racing, well, I'll wait and see what they're like.
I also hope they maybe offer DLC for the more niche things like the V8s.