My personal belief:

They will expand PHL and continue TTN service, then Bada-Bing, it's a PHL/TTN dual base similar to what they have with ORD/MDW. Once MDW is completely gone in April we'll be missing the ****ty dual base in Chicago, so naturally they'd want to open another somewhere else. It'll make commuting to the dual-base a nightmare of course but they won't give that a second thought.