Blender is not ready for that kind of competition. Setting aside the reality that it is not really something you could make a “real” competition out of. But I understand the point you are trying to make.
I do think your vision for Blender could come true, in time.
With more companies like this coming on board and perhaps a company with an interest directly in sculpting. Maybe a large jewelry design company?
Regarding the notion of a competition like this in general, you would not have to force it. The artistic community would make that decision on their own. Pretty much how it works.
You build better tools and the artists come. In that order.