If you're that pessimistic about your front-end code becoming obsolete, I'd strongly suggest looking into ClojureScript with https://github.com/reagent-project/reagent and (if you need SPA levels of coordinated state) https://github.com/day8/re-frame

The up-front costs are certainly higher in terms of the learning curve for the average dev, but it sure beats rewriting the whole thing every few years. reagent dates back to 2013 and has been mostly unscathed by the JS ecosystem churn. I'm under the impression that some (JS-based) React devs catch on to reagent pretty quickly, so the up-front costs might not even be that high.

Fantastic article, by the way!