I think that since they never wiped out commons or jps, never did any official bankruptcy....to go to a utility model, if the government is hell bent on running it to socialize housing, they would have to buy out current commons and jps.
I dont think the government has anyway to cancel the commons or jps especially with their BS conservatorship story and all the current litigation.
As they say: if you want a problem to go away, throw enough money at it, and it will. So, the government would need to negotiate a price for all holders to make the law suits and shareholders to disapear.
If they do not handle things right, they'll never be able to make a utility work. They'll probably hand off the urility business to a few of the banks but then have fhfa dictating their socialized business models, so probably lousy interest/dividends for any investors.
If they offered us a trade for shares in the new utility, Id be dead sent against it.