The way I understood revolt their idea of federation was more between different Revolt instances, but it's not a hugely discussed topic over there.
The frontend would be no issue Matrix-wise, it's not that difficult to build a Discord like client for Matrix if the actual backend would support the necessary features - which currently is not the case.
The Bridge (I run one myself) is only good to use it as long as you use still Discord,so more for a migratory phase,yes. And technically it's against their TOS,so it could end up bad for larger communities.
Anyway, it's clear that at least FOSS projects should definitely not work with Discord as a repository or support channel anymore.