Regulating them is a crock to begin with, so hopefully it gets passed. Criminals never do the paperwork on one. Plus, unlike the movies, no one goes around shooting everyone in a building with one "silently." And if you really want to, you can buy all the parts legally to assemble one from a maglite on eBay. Just like a sbr, it is not illegal until assembled without proper paperwork. Or any good machine shop could crank them out all day long.
I am a pessimist on it too. Lots of promises get made to get in office, but many of those never cross the Whitehouse threshold.
I think we might see some good prices on the used/resell market in a few months as the people that bought a bunch of guns before the election with hopes of racking up cash after need to pay rent. Kind of like the guys lining up to hoard .22LR over the past while. Just buying stuff to reduce supply and drive up prices. Same guys bought all the Tickle-Me Elmos at one point and sold them in the parking lot for double. It is just a profit racket for them. Leaving those of us that enjoy gun sports ( or Elmo lol) out in the cold.