If he is anything like my DGS, who lives with me, the answer to any change is always "no". Give him a little time to think about it, then mention it again taking in master's advice about the decision. He will come around, but needs time. I am facing the same situation with schools. BTW, once the change is accepted and done, he is usually great with it. I think it is the idea of change - many gifted kids are resistant to change.

Good luck.