Delaware County Dems are doing VERY well as of late. Curt Weldon's seat when retired will highly likely have a Democrat. Even your boy Rick Santorum was shocked at well Delaware Co. is doing.
But the big question is: Who do you guys have down there? Don't expect Weldon to leave anytime soon, Flyers. The guy has some major seniority. If he stays in longer than two more terms, the GOP really won't have to worry because of redistricting. If PA 7 really becomes a problem, they'll find a way to fix it.
Only if they have the governor's office.