If he actually got into an arms race with Russia, I'd consider this a good thing, since Russia can't sustain an arms race. I'm good with deploying one of the more effective strategies in the Cold War.
What a waste of time, human energy and money, not to mention all the collateral damage that would ensue. Sheesh.
It helped to win the first Cold War. Reagan managed to deploy enough and get the Russians to the table to negotiate with an arms race in the early 1980s. Of course, Reagan also stretched the Russians with entanglements in Afghanistan and Nicaragua, among other places. Reagan understood the Russians have one major Achilles' heel: a weak and fragile economy that can barely sustain an overextended national security state.
I see no problem in replicating that strategy and forcing the Russians to be strategically overextended. Of course, Trump won't do it but it should be done.