It's one month later and I am back to reply:

I don't want to replace HTTP, or the web. But, I also absolutely don't want to build anything in greater complexity than what we have today. In other words, keep it for what it's doing now, but having an isolated app/container based platform efficiently served through a browser might just be a good thing for everyone?

5 years ago I was writing rust code compiled to web-assembly and then struggling to get it to run in a browser. I did that because I couldn't write an efficient enough version of whatever the algorithm I was following in javascript - probably on account of most things being objects. I got it to run eventually with decent enough performance, but it wasn't fun gluing all that mess together. I think if there was a better delivery platform for WASM built into browsers and maybe eventually mobile platforms, it would probably be better than today's approach to cross-platform apps being served via HTTP.