I have most reason to doubt 8. I think it'll mature, but I doubt a fully "standard" stack will come about.
I suspect WASM will lead to a lot less stuff being done in JS.
I suspect WASM will lead to a lot less stuff being done in JS.
I agree with your intuition, though -- I don't think it'll become too widespread. Projects will start in all-js in the front-end, and no language will provide sufficient benefit to motivate rewriting half of the client.
I'm less sure about back-end development trends but I think "less standardised than the front-end" is a gimme. Maybe Node/Express or similar will pick up, but I feel like they've been waning the last few years. Go servers seem trendier.