I think Lemmy would either need to find a way to wean Redditors off of their dopamine machine or replace that dopamine machine long-term to sustain an exodus from Reddit. Either that, or Reddit will need to break their dopamine feedback loop. There are some cracks showing, and that might have already killed the platform in the long term, but it'll keep going from pure momentum for a while. Maybe as long as months or years.

Seems like there's more sexists and racists than I used to see over there, which is definitely offputting. I've found communities that are supportive of thoughtful discussion are more appealing, and Reddit definitely lacks that lately, outside of some small, relatively niche communities.