Board Thread:General Discussion/@comment-25132702-20140710032529/@comment-24330788-20140710034346

Not sure, I think the writers meant to leave that ambiguous. I've heard theories that maybe this particular future would only result if Mordecai and Rigby continue down the path of living with no rules, but that was never specifically stated in the episode. Future Mordecai could just mean they're living separately now so they don't hang out anymore, though I'll be honest, my first thought when I saw this scene was that Rigby actually died. Now that’s a depressing thought.