For me the majority isn't even relevant, I'm on Twitter specifically to follow certain people or organisations which are related to my interests. I barely use Twitter these days but most of the accounts I follow are still on Twitter and bascially nobody is active on Mastodon (or any other alternative I can access for that matter).
I love the idea of Mastodon, but it's worthless to me if my timeline is empty. Lemmy and Kbin are different because they're organised around topics instead of people.