I don’t see that happening. As long as those that taint Mastodon’s reputation are kept away things will be fine. “True believers” do not want more of everyone and that is part of the problem. People have various social needs that many on Mastodon don’t care about nor respect. If Threads wins them over by being more welcoming and accepting that says a lot. But, I must be fair. I have seen improvement within the culture and people actively working to be more open to others . I care more about users having their needs met than any one specific platform.