I think the test run will be if Americans will allow a "bail in" to happen. Some big bank fails, and the solution that the politicians come up with is to have the largest depositors lose their deposits. Under the 250k FDIC limit. Maybe to 100k.
After a few scattered bail-ins, we'll see the same thing happen with the investment firms. Morgan Stanley, Edward Jones, etc. They'll be raiding the 401k's they manage in bankruptcy proceedings with impunity, after doing a stellar job of hiding the impending bankruptcy from their investment base so that the small-fish investors don't pull up stakes.
Anything to protect NYC and Wall Street in particular.