Drones seem the obvious future to me. Bulk build and just overwhelm the manufacturing capacities of your enemies for pennies on the dollar.
Best case, we manage to get a few decent drones for $10m a pop, but we still risk getting shanked by a frickin' mob of Chinese crap, because they don't need to go that far to get into theatre. I dig what Anduril's trying[2] to do with Roadrunner, but it's still too damn expensive - the hard kill mechanism still results in a total loss-of-vehicle.
[1] I.e., quivering mass of overpaid box checkers getting salaried as Analyst IIIs.
[2] There's some whispers, too, that Anduril isn't actually able to operationalize any of their widgets at any sort of scale, but I don't have any inside eyes on this. I DO see, though, that their fab capacity is . . not amazing.
Why would China not win this arms race?