What is the worst case scenario when becoming a ski instructor? Is it that you have fewer regrets, enjoy yourself, make less money, and delay taking an office job for a few years?
Death is the worst case scenario in both situations; it has no bearing on making a decision here. It's also exceedingly unlikely.
The worst case scenario that is likely is, as said, making less money, possibly being unable to re-enter the tech field (though I consider that too unlikely to consider as well).
There's no obvious major downside to trying the ski instructor gig. I'd go for it if I thought I wanted it.