Specter was a RINO who became a DINO and everyone who knew him said his only party was himself. I suspect that coat-turners make lousy lobbyists (because they're unpopular with everybody) and they therefore find it hard to earn the big bucks in their post-congressional years.
Specter could retire or may end up as president of a small college somewhere, kissing donors' backsides for modest donations. If he lives long enough he will learn to loathe the question "Didn't you used to be Arlen Specter?"