User blog comment:Justarandomguy/Are the Quarians Doomed also?/@comment-170.173.0.16-20150321175831

I know this is way late, but thought I'd add in a little info here.

Mass relay technology isn't a total black box. There's quite a bit of talk at one point about the asari unlocking the secrets of mass relay technology, though it doesn't really progress past that point. I'd imagine that a long-lived race like the asari focusing all their efforts on such a thing (along with the fact that their homeworld likely has a lot of the research data) would probably see some of the longer-lived races, such as the asari and the newly cured krogan (if you cured them), able to achieve space flight before extinction again.

There's also the technology of tangled pair comms that may or may not have survived; this would allow very limited communication between systems if it's intact. Ultimately, there's a lot of unanswered questions. I do know the standard comm buoys are near-instantaneous (they use laz0r optics through the mass relays), but they require mass relays in order to perform FTL comms, unlike tangled pair comms, so communication would be largely impossible.