I think we'll see a temporary "return to normalcy" after the protest finishes and most subs come back online. But come June 30 and the end of third-party apps, we'll see a bunch of users come back to Lemmy/Kbin again.
In a way, this seems like the best way of driving things. The protest has raised awareness and got a ton of development work going, and then there's going to be a respite giving instances time to prepare themselves for the second surge.