Back in the day we were very concerned about nuclear war. First strike, second strike, security of deterrents, all were important subjects, to be explored by academics and movie makers. The concern then was that the Soviet Union would do a first strike, a strike sufficient to destroy our ability to retaliate.
Since 1989 we've lost the edge on that concern. But because our nuclear forces are getting obsolete, and because North Korea is developing the missile/Hbomb combination needed to attack the US, we're seeing a resumption of the discussion, including in the Post today.
Personally I'm supportive of the argument. I don't see Russia or China as the sort of power which aims for global dominance (based on what we've learned since 1989, it seems the USSR never really aimed for that dominance) and other powers, like North Korea, see nuclear warfare as a deterrent.
So yes, I'd cut our forces back.