I don't have solidified idea for reinventing web dev but I'm oscillating between two opposing strategies. One would be to have a micro app server in hardware - think RPi nano or even less, where each http session gets a dedicated "box" thus returning to the model of development that reduces everything to a single user, single process system. Persistence becomes a challenge. Ideally it would be a truly shared hardware component or alternatively it would be a swarm of tiny disks that can be queried independently and in aggregate.

The opposite idea would be to build a single OS on top of distributed hardware that presents resources in a truly unified fashion where the illusion of programming and deploying to a single machine is unbroken and none of the underlying abstractions leak up. Think VMware but in reverse.

The other thing that must be done over is the DOM/JS paradigm. It's so absurdly and ridiculously complex for what it does that it makes most developers laughable unproductive. There is no reason there couldn't be an environment like Delphi or VB but geared to the web developer. Wasm is a ray of hope here as its cutting loose the inane JS/DOM paradigm and finally offering a plain programmable canvas to the browser for the first time since the demise of Flash an Java applets before it.