I figure it's like any other flood.

Users will rush in, there'll be a high-water point, and the tide will roll back.

It's too early to guess how many folks will remain vs return to reddit, but I doubt anything that happens on Lemmy this week can possibly be representative of what things will feel like one, two weeks from now.

At any rate, reddit's numbers are way too artificial these days due to bots & spammers for their user metrics to be very meaningful, just like Twitter.

Stay the course where you want to see change. For me, that's no longer reddit. ¯\_(ツ)_/¯