Those who still provide bitcoin service with a one-man-start-up-hobby-firm will be replaced by the real entrepreneurs.
At the time MtGox was started up, Jed was the person best able to do this. At the time MtGox was taken to the next level, MagicalTux was the person best placed to do this.
As for the future, that will depend on how MagicalTux extricates his business from this situation. MtGox might emerge stronger than ever, or it might have blown its credibility enough that it never fully recovers.
But MagicalTux, and Jed before him, were always doing stuff that was good for Bitcoin. Without them, the forum would be full of "We need a big exchange" posts.