I would say that, much like a pinball machine, you can not "bulletproof" an older arcade game like Tron. Your best bet at modernizing and bulletproofing is via emulation, but of course no real arcade game person wants that. The nature of the beast with most of those older games is that you can address the weak links (old/failing caps, batteries, certain connectors, etc.) but given the age and design of some of them even a restored or re-worked game can pop up new issues. But some people like fixing them too, just as many like fixing pinball machines even more than playing them. Only problem is many video games don't have as much aftermarket board support for when you just want a newer/updated board compared to older pins.

That said, in my experience (couple thousand pinball machines and video games owned, combined) a video game is less likely than a similarly aged pinball machine to give you too much trouble. Until you move it of course, then all bets are off.