I think it crashes without new legislation - passed and signed into law. I.e., the current laws are heading us toward crash.
Further, I think avoiding this requires:
A (conservative) congress in both houses to propose and pass the new laws (or repeal current ones); and,
a veto proof majority if Obama is in office or a NotObama president that will not veto but sign them into law.
It is mathematically impossible (much less politically) to stop it now. America is going to hit the wall.