I doubt it. I have been flying as a FO on the 88 with most Captains coming from the 75/76. It is a very different lifestyle. Fast pace. Busy. Multiple legs. Most of the wide body pilots don't want that 717/M88 life.
I hear it first hand from the guys I fly with and I have yet to fly with someone who came off a wide body.
The guys who just upgraded from international flying complain for at least half of the trip and can't stop comparing the flying to their previous life.
I think we'll see more junior upgrades IMHO.