Mecha was a 1960s-1980s war-inspired fascination that maybe, if anything, we should be surprised at the longevity of. We haven't really been getting that many giant robots or pilotable mechs in popular media outside of Japanese animation.
Mecha is never going to disappear. Mecha are great for toy sales.
Patlabor wasn’t war-inspired; you might enjoy it’s contrast to gundam-type mecha stories. The Labors represent the rise of technological power that can be employed by a single person and all the effects that can have.
There is an upcoming Mech movie Atlas, starring Jennifer Lopez with a heavy Titanfall vibe.
I always felt like the big explosion was the 80s, not to say the 70s was unremarkable and the 90s just had a lot of really good stuff like turn A, Eva (I dislike it) and King of braves GGG