Not raising the debt ceiling now could very likely be Armageddon: it would immediately force the government to spend no more than it took in in taxes. In 2010, tax revenue covered not even 60% of federal spending, so over 40% of the federal budget would have to be cut NOW to make up for it. Unemployment benefits—ended. Air Force jets—grounded. You need heart surgery, grandma? Maybe next year.
Not raising the debt ceiling would not necessarily lead to defaulting on the debt: the US could still make its interest payments. However, some prominent Republicans are now suggesting that even defaulting on the debt wouldn’t be that bad. Since the election of George Washington, the federal government has never defaulted. Is it really worth throwing that legacy away to make a political point? Defaulting on the debt would very likely lead to higher interest rates and make the debts of private individuals as well as those of many governments even more onerous. An outright default could wreak havoc on the domestic and global financial systems.
Such an outcome could be a sure way to reduce the Republican party to the party of the 30% and make it radioactive for years to come.