Try and look at this simply. There's a million what ifs and gotchas in aviation. Take your pick of doomsday scenarios.
What we do know is as this global economy turns, which it will, driven by consumption and a burgeoning emerging market middle class-the price of fuel will go up.
The 76 seaters are a stop gap. Like the 50s they also meet their apex of revenue vs cost at a certain fuel price and mxt cost. They to will become dinosaurs.
Where the orders? The Max and NEO and stop gap 76 seaters. Why? Because looking 10-15 years down the road these jets (Max Neo) are all the strategists have to go one from planning. They burn less gas, sell more stuff and the smaller jets fill in where they don't make sense.
The jets HAVE to become bigger, more efficient, more densely packed and sell more stuff to make money over time.
If your on the bottom of the list at a regional better scramble up to halfway or get your resume polished up. The regionals are shrinking. They are dying not because what some pilots want in scope but because soon their jets just won't be big enough to turn a buck on a lot of flying. They will have a place. They will have a role but a much smaller one going forward. Not rocket surgery here.