Agree... they'll definitely evolve and get better, we're in the floppy disk era, but so far they suck. Nothing but weird motion, a shitty echo of mainstream / stock footage.
I also get the sense that in the early days where data curation matters, research teams need to hire curators that can siphon good from bad examples. E.g. don't train on shit stock footage, pick up a book on fine art photographers, train on that shit + good films and you'll get a pretty good model.
In the future I suspect curation will matter less and less because in the limit you should train on literally the entire internet.
I'm definitely excited for where it might go though. If it ever develops to a sophisticated point, which it most certainly will, we'll be able to do stuff with it that is just impossible by typical production means.