How Does the Debt Ceiling Standoff End?

I think Paul Krugman actually has created a pretty decent verbal flow chart:

So how does this end? The votes to fund the government and raise the debt ceiling are there, and always have been: every Democrat in the House would vote for the necessary measures, and so would enough Republicans. The problem is that G.O.P. leaders, fearing the wrath of the radicals, haven’t been willing to allow such votes. What would change their minds?

Ironically, considering who got us into our economic mess, the most plausible answer is that Wall Street will come to the rescue — that the big money will tell Republican leaders that they have to put an end to the nonsense.

But what if even the plutocrats lack the power to rein in the radicals? In that case, Mr. Obama will either let default happen or find some way of defying the blackmailers, trading a financial crisis for a constitutional crisis.