The last major holdouts in the protest against Reddit’s API pricing relented, abandoning the so-called “John Oliver rules” which only allowed posts featuring the TV host. It's the official end of the battle. The Reddit protest is over, and Reddit won.
Lemmy has already hit critical mass to sustain itself so from here on out it will only grow. It surpassed the danger zone where engagement wouldn’t be enough to bring people back. On top of that, the best lemmy clients already blow Reddit’s official client out of the water. Now all that needs to happen is for more communities to grow.
Is there something in particular that makes you think that?
General submissions have tons of comments, so there are actual discussions going on, motivating users to check back often. Also (at least for now), the discussions have less noise.
Content-based subreddits (like instantkarma, holdmyfries) where there is minimal discussion can be easily replicated with a bot, until organic submissions reach a critical mass.
That leaves community based subreddits, but when Reddit aggravates the community leaders they can easily move (like piracy did).