The thing alot of ME fans forget, is that the Mass effect relays just simply allow faster travel then conventional FTL which would take years other wise A.K.A No one is trapped, but there will be heavy losses due to the time it will take.
-It will take the Quarians at least a few generations if they're about the life span as humans. -Asari live to see 1000 of years so it'd be hard but they could make in less then a generation or two at max. -Krogan are gonna have probably the hardest time due to their high birth rates (especially with a Cured Genophage) but also the easiest as the Krogan's home is the closest to Sol. -The Salarain's home is the second closest(the reaper at the bottom left is in Sol) but they're probably going to have alot of dead due to their short life span. -Geth, we've never heard of an actual life span(a.k.a we don't know if they die of old age) for geth so they techinally won't lose much physically if they travel slowly back to the Quarian's home cluster.
Now the thing is the whole ME franchise is about loss for the ultimate reward(we as a civilization can keep going) that's the way it was in ME1(you can either let the Consul die or sacrifice 8 human ships to save them) and ME2 (Even though you saved everyone on your crew 1000s still died to make the final boss what it was, and you're left to choose weather to destroy the thing that made the boss or hand it over to a man you're not sure if you can trust) ME3 gives you the decision to save the world but at the cost of millions (possibly billions) being displaced, for the life of every single person in the galaxy. It's the way Mass effect always has been. To suddenly be unhappy just because it's not that whole "and then everything's alright the heroes fine and the universe is the way it was now free of that threat" hollywood bull after 2 games of the opposite is kinda silly
I was happy to see that Hugo won some Oscars, Rango won the Oscar for Best Animated Movie and Midnight in Paris won the Oscar for Best Original Screenplay just like I predicted but I wished that Hugo won the Oscar for Best Movie and Best Adapted Screenplay and I wished that Transformers 3 or The Rise of the Planet of the Apes won the Oscar for Best Effects.
The thing is if you were on the set of tf3 directed by Micheal bay and people hated you for the scripts bad writing saying your acting sucks. Also we don't know the full story as the onlookers might have been loud during a shot, heckling shia or what ever(think Christian bales terminator 4 freakout). The thing is hollywood hasn't been nice to him so he's really had no reason to be nice back