Ultimately, regionals are still businesses and there will come a time when they will absolutely not be able to offer their services for any less; I think/hope that we are approaching that point.

I think the premise of the original post is that they will not make for good investments for very much longer- I cannot argue with that at all. They have already cut costs/pay so much that very soon (as posted earlier) some of them will not be able to make a profit even if they had no labor costs.