Plus the fact that the executive branch(Treasury) has imposed a "winddown" of the portfolio, aka liquidation. Congress didn't oppose it. I am not saying that it is legal or illegal, just that they were/are doing it to dome degree.
It could be "wound down" without r-ship. Not legal in my opinion, but people do illegal things all the time.
I think the only legal way to do it is thru r-ship. That would be devastating to housing(25% of the u.s, economy) and hence will not happen. It would be Lehman times 10.....
Again, I know we all know this stuff, just re-stating.