However there is a point to be made on the opposite direction: I mean a deflationary scenario as a result of the unwinding of the liquidity provision.
If the Fed obtains any profit due to its operation (given a revaluation of financial assets bought, which would, of course be, a good news) it would end up withdrawing more cash from the market than the formerly issued. This could trigger a new dry up on the markets. So, it is not just about returning to the pre-crisis balance sheet of Fed.