What is this paradigm of computing that we're currently in the late stage of?

It's not the "web" paradigm, because the web has faded to a background player.

Omnipresent but dull and uninteresting.

It's not the "app" paradigm, because that ignores the stage that came before it.

To use terminology from Carlotta Perez, the web was the installation period (discovery / exponential growth) and apps were the deployment period (optimization / centralization).

Together, web + apps are one paradigm.

I think the right name for the paradigm is the thing both periods have in common: it's the same-origin paradigm.

The same-origin paradigm is the laws of physics that both periods of this paradigm have in common; the animating logic for this whole current universe.

The same origin model has been so prevalent for 30 years that we literally can't imagine anything else

It colors all of our assumptions about privacy models (and thus the horizon of viable experiences) for everything.

But this universe is approaching its heat death.

All of the interesting things possible in this universe have already happened.

This universe will never go away, it will just become even more boring.

We need a new universe on top of this one.

We need to layer on new laws of physics.