Why can't we build interstate highways any more? Why does high speed rail cost so much? Why have there been no nuclear power plants built in decades? Government regulations.
Regulations accrete upon the nation like barnacles on a ship's hull. Every year new laws are passed that govern every aspect of our lives from the food we eat to the contracts we sign to the way in which the government is allowed to spend money. Each regulation is tiny in and of itself, but taken as a whole, they act to make it harder and harder to accomplish anything. Each year you get less output for the same money.
While gridlock will slow down the creation of new monstrosities like Obamacare or Dodd-Frank, it will do nothing to eliminate the growing mountain of regulations.