Gonna be a bit of a rant, but I think theres a few points to bring up about this tech
Metahuman is probably going to push other character generators to have a face animation quality around 80% of metahumans. 1200 bones on a single character is extremely excessive when talking about npcs, but you could possibly get close with ~200 bones + ~60 or so blendshapes. Strand hair still requires an rtx 30 series to have playable framerates (if you want literally anything else in your game), so you'd just have a bunch of bald characters running around...
BUT, because they released the maya rig for free, we should see a general increase in the quality of character deformations from new games as they now have a benchmark with breakdowns to go off of.
This will be great for the... realistic visual novels? Not sure what they are called... Most of their work is done offline from what I can tell and if you just take a metahuman rig, wrap deform a nude mesh + some tinkering and sculpting, you could get amazing results with not a huge amount of effort. A lot of movies will do something similar in order to get characters animated without needing to re-rig 800 characters from scratch.
In our game, we're using the new maya rig as an example of how to do corrective body deformations. The face rig is too complex to easily breakdown and that level of quality just isn't necessary. I've always seen dope body rigs from Steve(Wildlife), but had no idea how it works. This rig is very similar to his in a lot of ways, so it's a great way to rip apart the back end and get a similar result.
At the end of the day 90% of us have some form of stylization in our games, so a hyper real character creator will only do us so much.
In terms of the non-adult world. Virtual productions need to run at 120 fps in order to not cause errors while on set(most sets don't have 3090s or quadro a6000s yet...). These characters are too intensive for it to revolutionize the virtual production world as it stands today, but a few years down the line, we could see some really cool "live" TV broadcasts.