The question can't really be phrased without spoilers but I think most people are getting this far by now.
At the end of every ending I've seen thus far we see a large energy surge going through the Mass Relays that seems to result in them exploding (hence the shockwave that crashes the Normandy). This seems to imply that most of the galaxy is now cut off from one another and interstellar travel is going to grind to a halt until the relays are rebuilt. Do the systems involved end up destroyed (see DLC content regarding the Bahak system's relay being destroyed)?
Is there a canonical source (comic, dlc, book, game) that would explain if this interpretation is correct?