E I just think you severely overvalue the impact he can make and vastly underrate how important Sherrod is to this team.
Really? Let's take a look at some hard numbers. I have normalized these by dividing by every ten minutes played (I used ten to make the numbers a little more palatable for discussion):
______Points/Min_Rebounds/Min_TO/Min_Assists/Min
Wright _4.30______1.21_________0.86____0.30
Gray___3.02______1.01_________0.40____0.36
I think most would agree that we could expect Gray to improve some with consistent playing time to allow him to get into a rhythm. While Wright has a lead in the points category, if you factor in his hideous turnover numbers (more than twice as many per minute than Gray), it really negates Wright's contributions.
I have not done this in the above numbers, but if you factor out games when Gray only got garbage minutes, which one could argue is justified since it is hard to come in cold and perform right away it would likely improve his numbers. Additionally, it further handicaps Gray when he gets yanked after making a mistake. It does not give him time to recover.
I am not saying Vaughn Gray is putting up superstar numbers, but Wright has not been performing like a superstar for almost the entire year. He has been given a chance to show what he can do and I would argue it is not impressive for a supposed superstar player. His defensive issues are starting to outweigh his offensive issues, and with his recent slump, he is more of a liability at the present time.
It is long overdue that Gray be given a fighting chance, with meaningful minutes to see if he can turn into a star. At this point, the numbers show he is not really a downgrade from Wright, and he has more potential upside (more room to show improvement and we have him for another year).