The Fed could if it were legal. But it’s not. Proof is that there are two states where there is only one insurer and next year there will be several where there is none. If Obama could just print money to fix this don’t you think he would have done it already? They could potentially stave off collapse by budgeting more money and bumping up the subsidies but that would require some heavy lifting politically. And if they did, anyone who voted for it would probably face defeat in 2018.
Obama didn’t control the Fed.
The Fed would act to prevent collapse. That’s what the Fed does. So Obamacare could not just die on its own. The increase rates are in the legislation already tied to the CPI-Medical. The bonds are issued on autopilot. If there are no buyers, the conservative hope, the Fed just buys them.
There is no path to victory doing nothing.