Those talking about ignoring the debt limit have it backwards

The debt ceiling isn't something imposed by congress on the executive. It is constitutionally the power of Congress, not the executive, to borrow money. The debt ceiling is the terms of the authorization that congress gives the Treasury to sell bonds. If you repealed all laws concerning the debt ceiling, the result would not be that the Treasury could sell as many bonds as it wanted or needed to. The result would be that it couldn't sell them at all.