More detailed reporting of the Chairman's remarks reveals concern over a run on money-market funds. The financial crisis of 2008 almost achieved critical mass when money-market funds threatened to break below $1 of NAV. Nothing has changed and the money-market fund your bank says is as good as cash contains nothing more than IOUs from counterparties who can still go bust in a heartbeat. The best decision is to prohibit money market funds from owning anything other than cash but that won't happen because the Fed would rather "assemble data on repos" as a fig leaf.
Maybe Helicopter Ben wants out when his term expires because he knows the Fed, owned by its member banks, will not tolerate any changes to money-market funds that reduce their usefulness as off-balance sheet funding tools. Tighter capital controls mean less lending but banks are hardly lending anyway without government backstops. The Chairman is having his moments of clarity long after the political will to force real changes on banks evaporated. The next crisis will be upon us with no advance notice. Federal Reserve officials concerned about their place in history won't want to be around when it hits. "I'll be gone, you'll be gone."