This might actually get more people to move to Mastodon as the influencer accounts will want as many eyeballs as possible instead of only people with a twitter account, and these companies are rich enough to setup their Mastodon instance where they get to control their content instead of Musk.
People are going to want to try different things, as it's complete chaos right now since the foundations of Internet advertising is being shaken to its core because of all the centralized services are making one bad decision after another.
New forms of marketing will definitely emerge from this, we just don't know what yet, but setting up a Mastodon or Lemmy server should be trivial for these large media companies, and they won't have to deal with verification anymore.