...go to Pensacola in the present day. What you have is a very nice regional airport that does about three times the passenger volume of PCB
Actually, they do more than 5 times the volume!
Their big goal right now is getting one of the coveted daily non-stop slots into Reagan/Washinton National. (Which would actually be a pretty big coup because of how tightly those slots are capped)
Last year during Christmas, ASA ran flights from VPS to NYC using 50 seat jets that would have normally been sitting on the ground somewhere due to the holiday schedule. I did some digging and found that those flights did pretty well but, in the grand scheme of things, did not pose the best usage for the aircraft. It is not being done again this year so my guess is that the yield that they were getting from the flights didn't warrant doing it again.
Regarding DCA...all of the passenger info gets analyzed to the "n'th" degree. If traffic warranted it, again, it would be looked at; however, no airline is going to pull a 150+ seat aircraft off of a route that is routinely full to service a small city with a 50 seat aircraft instead. It's simple math...