I really don't expect the picture to be any different with x86 over ARM. I expect they'll machine translate x86 instructions into native ARM instructions in some way and cache them somewhere, but the results won't get anywhere close to x86 performance and there'll be a whole bunch of caveats about software it will or won't run. It'll probably be fine for running more sedentary apps.
I very much doubt anybody will be playing Crysis 2 on it. In fact I'd be surprised if any remotely demanding game played on it. Not just just because of the emulation but because no game would be tested with the GPU so they are liable to break hard for one reason or another.
However, it would be a very good gesture if Fitbit had the rights to the platform and unlocked it for the community. Personally I think the best course of action would be to avoid smart watches altogether in their present form.
And on a general point this just demonstrates why "smart" watches suck. They're closed platforms and when the platform is discontinued you're left with a bitrotten brain dead piece of crap. Just one more reason to buy a dumb watch.
Gentoo lets you use systemD if you want to, hence the availability of systemD packages for Gentoo.
However, OpenRC is the default.
FDM style printers (the cheapest kind) require wrapping your head around calibration, nozzle diameters, temperatures, slices, alignments, supports, bed heating, the properties of PLA / ABS and all the rest. If you're lucky you'll set the printer going and hours later your efforts will yield some crudely finished single colour part. If you're unlucky you'll come back to discover something that has skewed left, warped on its base, or turned into some dante-esque spider's web that has stuck to everything.
Maybe SLA is better? Well it certainly yields better parts for sure (assuming it cured properly, but then you also must have space for a wash station. And all the sticky, smelly gunk resins to work with that get on EVERYTHING. Beyond that you've got stuff like SLS, SLM etc where things get more interesting. But now we're talking industrial equipment with the costs and power consumption to match.
I think the most likely form of 3D printing to take off is one which hasn't gotten much press - laminate printers. The price has to come down much more than where it is to be consumer attractive but I think that's viable.
Anyway I expect that if this administration-to-be were to go down this path of fuckwittery they sure as hell wouldn't get any cooperation from any tech company. I expect their efforts wouldn't get much cooperation from anybody for that matter.
I have a theory that it's impossible to prove anything, but I can't prove it.