Biggest risk is undermining of confidence in the rule of law as gov agencies trump the law, businesses shy away from trust in gov, private banks refuse to make affordable 30 year home loans, homeowners suffer from higher mortgages, demand weakens driving down home prices and a repeat of 2007-2009 occurs. This time gov won’t be able to pin the blame on GSEs, and might not be able to stop collapse. Gov can take over GSEs and add $6 Trillion of liabilities to gov B/S.
Or they can end the Sweep now, recapitalize GSEs, use DTAs and accounting voodoo to reverse the reserves for losses they forced on GSEs, and release GSEs from conservatorship. They ably back-stopped housing finance for 70 years before repeal of Glass Steagall in 1999 turned banks loose into sub-prime toxic mortgage behemoths.
GSE reform has tightened their operations. They just need to recapitalize and be released to continue doing the job they’ve done well for decades, adding fuel to American economic growth and prosperity.