Doubt it, it's expensive to host and creators won't have ways to ways to monetize it as easily as YouTube.
Also, I wouldn't really call the Twitter and Reddit cases "exodus". As much as I would like to see the fediverse succeed, the number of users on mastodon and Lemmy are just a blip on the radar.
I still see the same links on my Lemmy frontage days after they have been submitted, it's far less active than Reddit.