OK, I'll play. I think this is a wheel within a wheel, designed to feed a beast nothing but air. POTUS orders a ban. A ban on an item that the regulatory agency (ATFE tech branch) deemed OK to own, manufacture, possess. These things were purchased by consumers, with no real accountability since there were no serial numbers or 4473's. The ban issued by POTUS clearly redefines these things as something that they are NOT. Also, it punishes the owners monetarily, since the only alternatives are either surrendering/destroying their legally purchased (and possibly constitutionally protected) property, or face the full wrath of the federal government, becoming felons 90 days hence. As I understand it, there's no provision for compensation or buyback, or an opportunity to register these contraptions as a lawfully owned NFA item (and if there were an opportunity to register as NFA, it would likely involve a $200 tax and the usual list of other hoops to leap through). Just unconditional surrender of property, or outlawry. According to the ATFE, there may be as many as HALF A MILLION of these contraptions in circulation- at least, I think that is the number I remember they gave. Thats a big number. Of course, none of this even discusses the very dangerous precedent being set. So why do I think this is a wheel within a wheel? Because I think this is a measure not only DESTINED for failure, but DESIGNED for failure, legally speaking (consider the current composition of SCOTUS). The former POTUS, with all of his minions and allies, didn't accomplish a whole lot on gun control (he admitted that this was his greatest failure). I recall some tears on the steps of the White House, with the requisite props strategically placed. So, when this think fails to meet constitutional muster (and I think it will) the average low information American will think that POTUS "at least tried". Things will go on as they have, the 2A battle continues, and the "gun lobby" remains public enemy #1 of everyone who never has, and never will like us.
Also, remember that the ATF is a law enforcement agency (originally a regulatory agency; they didn't begin to get involved with firearms laws until 1968). But, as a law enforcement agency, they are given the unusual latitude to "interpret" and "give opinions" that in effect, are federal law. This in and of itself is a slippery slope, IMO. Also, their prior "interpretations" that have been "carved in stone", along with the "findings" of their tech branch have been the legal fodder that as of late have been the basis for the legality of things like unregulated suppressors for muzzleloaders, pistol braces (and the debacles that followed), Mossberg shockwaves and similar firearms, binary triggers, and these bumpstocks. Even though I own none of these, and have no interest in them, I consider these "wins" that they served the 2A community on a silver platter. I also find it somewhat humorous.