This "problem" is so much more than the word "shortage" that this thread should be 1,000,000 pages long to put it all down. A lot of people keep looking at the amount of certificates out there. That number is inaccurate because how many of those guys are retired or can no longer hold a medical. Then regionals can't staff their flying because they can't pay enough. Some guys are in cushy 91gigs and have no plans to leave. And some guys just refuse to work for a package of .6oz lightly salted peanuts. Whether you agree that there is a shortage of pilots or not, there is a BIG problem brewing in the industry right now. And it is going to get worse before it gets better.
Eidt to add: It just seems no one wants to acknowledge the elephant sitting in the room. With all the new rules and regs, something has to change. The storm is on the horizon. Be it a shortage or people just packing up and leaving before it hits. Big changes are coming. What they will be? You'd be foolish to bet on black right now.