I think that's a very disappointing point of view, and I say that as a someone who used Ruby in the past. In light of this I can say it will not be my go-to language in the future.
I feel like after a certain point of community uptake, a project surpasses any single developer and becomes a part of that community in and of itself. I understand wanting to maintain control of your pet project, but for community projects I feel like there should be community control. That said, you should have the freedom and the right to do whatever you want with your pet project. Maybe the solution is for the community to fork so they can make the changes they see fit.
Given the way the MRI devs and Matz in particular have responded, perhaps it's time for the community to fork Ruby if they don't like the way Matz insists on remaining the dictator. It's his project and he can do what he wants with it, but we don't have to use it.