I should mention a new angle that's getting some traction amongst commentators today:
Boehner's Plan B was loaded with Republican valentines, and one minute Republican compromise: a millionaire tax. House Republicans had about a 60/40 split against it, but that indicates that 40% of the House GOP can deal pragmatically.
If that's the case, Boehner has just proven that the Tea Partiers won't negotiate, so he can plow forward to carve out a centrist deal with the 40% of pragmatic Republicans and the House Democrats.
That's a plausible way forward, but it moves negotiations back even stronger into Obama's hands, and it means Boehner might not be the Speaker for much longer.