I think we have already seen this happen with the whole Pinnacle/Mesaba/Colgan --> Endeavor merger. As is usually the case, Delta was thinking ahead of the game.
I would think that we will see more consolidation as the current "regional" pilot supply situation plays itself out. I hope it doesn't but I fear that we are likely to see more TSA/Go Jet and SkyWest/ExpressJet kind of scenarios play out.