Although I'm over a year late, I'll weigh my opinion on this topic to maybe revive this thread:
I feel that Chandler Parsons has the potential to become a franchise player. Although he seems like a drastic downgrade from Nowitzki, the guy can play his position with little flaws. As he gains more experience, he can bring out the potential that he has shown throughout his career with the Rockets. Heck, he's already showing potential with his recent games with the Mavs.
Overall, I feel like Parsons will be the franchise player. He just needs the correct tools, and Dirk could possibly even coach and help him with his shooting to perfect it.