I think the 2020's might see a bit of a resurgence of low-level AD among NATO/FVEY nations.
I'm thinking a lot more than a bit. As peer-peer conflict comes back into view, politically, nations who have focused on COIN and asymmetric warfare for the last 15 years are pivoting to find out that their old potential adversaries have not been standing still while they fought in the deserts.
There are a LOT of doctrinal roosters coming home to perch at the moment.
Western Navies are rediscovering that they need sophisticated anti-shipping strike, long range anti-missile defence and really sophisticate ASW capability that they have let lapse since the early 90s. Air Forces are rediscovering that they need to be able to win air superiority in an incredibly contested air and electronic space. Armies are noticing that sabres are being rattled, sabres that need more than wheeled vehicles to combat and that their tracked platforms are 40 years old and aging. And seriously sophisticated cyber warfare is a brand new thing compared to the last time the West's militaries looked beyond long term, low intensity sustained COIN ops.
There is a LOT of money needed to revamp the world's militaries to face near peer adversaries, yet there is nowhere near enough money to do all the needed things in the short term. 30 years of low intensity focus is going to take quite a while to overcome.
Paul