This article does not mention another emergent military domain, space. Spending on missiles, missile defense, and space capabilities will shape the bulk of military spending, inclduing research and production, going forward.

This will not obviate the need for boots on the ground and here a transition is underway to autonomous machines on the ground, in the air, and beneath of surface of the seas.

All of the this presages a shift in military spending and potentially increases inorder to catch up and dominate. While the primary players will be the US, Russia, China, and India, this trend will spill over into the entire international arms market.

Alex Krainer's TrendCompass
Why hypersonic weapons change everything