This has a "let's start all over" feel to it. That's usually not the optimal way to make big changes. All of the design principals could be implemented and ado

This has a "let's start all over" feel to it. That's usually not the optimal way to make big changes. All of the design principals could be implemented and adopted incrementally within the current system (and to a greater or lesser degree have been). This gives a current system a massive competitive advantage. E.g, to the extent you could convince many people to use a certain unified data representation (we have many dozens to choose between!), they can adopt it without swapping out everything else at the same time. They don't need to switch to the newweb to get the part they want, so why would they? The entanglements of the current web make a wholesale switch to something else an extremely difficult sell.