Actually, the language of the ruling guarantees this will return to the court. By simply saying that a kit which can be readily converted into a working weapon in 30 minutes qualifies as a weapon,...neither does the ruling set further definitions and/or limits as to how a collection of parts might further be defined as meeting a standard, and leaves the defining of a standard to ATF.
Yet, the just last year, this same court struck down the Cheveron Deference that gave agencies such as ATF to make such determinations with the wide latitude and abuse they have historically exhibited. So at most, the SCOTUS has only given instruction as to the specific type of nearly complete kit at issue in this case,...which is not just an 80% receiver, but also every other part of the gun needed, and a 30 minute time limit.
An 80% receiver all by itself seems to be still entirely unregulated. Likewise, parts kits without an 80% receiver included seem left unregulated in the wake of this. All thanks to striking down the Cheveron Deference last year. If it hadn't been for that,...yes,...everything would be in jeopardy now. But it isn't. Not yet. If a future SCOTUS re-institutes Cheveron Deference, yes, then it's a problem. Or Democrats return to power,...then it's a problem.
All this just reinforces how essential it is to eventually see the GCA of 68' obliterated as unconstitutional in it's entirety,...and the NFA of 34',...and the GOPA of 86',...and all that filthy schit.
For now, however, things seem essentially unaltered. Just don't sell the entire build kit together,...for now.