I wouldn't call it a matter of need. While I want to see Lemmy grow, I don't think that we should rely on outrage on another platform to drive our own activity in the long term. While the number of users joining has slowed down, it certainly hasn't halted.

All we can do is make Lemmy as solid and enticing of a platform as possible, and leave those on Reddit to choose between supporting a platform they don't like and leaving. We shouldn't be responsible for forcing their hand, but we should be responsible for maintaining a healthy community here.

I think even something like a indie video game developer hosting a forum on Lemmy instead of Reddit would do wonders for making Lemmy "mainstream". Or even a youtuber, streamer, or some other content creator at that. But of course, it's not something I'd go out of my way to do; just something that I think will happen in due time.