I don't see the point in it, keeping suppressors NFA bound only exponentially limits suppressor sales. The desire for a "conspiracy" doesnt make sense when EVERYONE making and selling cans would win big from them not being NFA devices.
I also have to partially disagree with
@whatluck ; sure there are going to be skinflint cans but they're not going to disrupt the market that much, if anything those devices will satisfy a desire at the lower end of the market. Let's not pretend people haven't been developing these things right along and even making them as prototypes (or in some cases they do some trickeration on the controlled parts or offer cheap rebuilds to customers) they just dont bother selling them as much because the buyer market for cans is not sated right now by that kind of junk, but lets not pretend an absence of regulatory BS suddenly changes physics and material science. (Actually there already is a burgeoning skinflint can market, mostly in 22 LR
cans and that kind of thing where people dont want to pay a lot for a plinker).