Here is a parable that might be instructive.
Here in Arizona, we had unregulated open carry available since statehood, but CCW was always illegal. Then in 1994, we finally got a CCW permit scheme. (Loooooong story behind how that finally happened.) Of course, the libs were screeching from the rooftops that there would be blood running in the streets with concealed guns everywhere. But that didn't happen. On the 10 year anniversary, Alan Korwin, the author of the Gun Owner's Guide you are likely familiar with, urged that with a decade of the sky not falling, it had been demonstrated that CCW was not inherently bad or evil or dangerous,...and if we still had unregulated open carry, why were we requiring permits for carriers to act like gentlemen and cover their hogleg? CCW had been normalized and it was no longer unusual. From Alan's seed of an idea, there grew a movement to make CCW unregulated as well and to eliminate the need for a permit. Ultimately it succeeded. And while there is still a permit to get if you want it, it is no longer required.
My point here is that I think we will end up seeing much the same with the effect FRTs and SuperSafetys upon the entire class of machineguns. While these devices meet the technicality of not being a machinegun,...they do, however, in practical effect produce what machineguns offer.
So while none of us want to wait 10 years,...consider the effect culturally of 10 years of normalization of "simulated" machinegun ownership by anyone who wants it. Imagine the argument being about "why are we regulating these over here when they can just buy those over there?" At that time, if we have a friendly administration, it will not be such a stretch to propose that the inclusion of MGs in the NFA is superfluous and ineffective. There will by that time also be 10 years of suppressors, SBRs and SBSs out there being normalized,...demonstrating how the NFA had always been a needlessly paranoid delusion. Also bear in mind, kids who are today in their teens and early 20s will be in their prime voting and earning and spending ages by then. Like many of us, they will have grown up seeing neato machineguns on the screen that they know they can't reasonably expect to afford,...unless,....
Anyway,...like I say,...I don't want to have to wait that long. But I have a good feeling about where this is headed. If we can achieve our goals before then, great! But if what we currently have is all we get for now,...I'm not gonna let up, but neither am I in despair. We have momentum.