You've made several nebulous claims.

Why will it be better?

Why won't it be subject to similar failure modes as the present Internet?

What specifically do you see it improving on? How?

What can it not fix? Why not?

What does a rough timeline for adoption look like? 2 decades? (Genuine question)

Much less. I'd say < 5 years. The rate at which people are onboarding onto Web 3 technologies and building stuff is increasing rapidly. You can check out the IPFS blog, the Protocol Labs blog, and see who is being sponsored in the space. People are building all kinds of useful software.

Here are some examples if you wish to watch a presentation on the finalists from a recent hackathon.

https://www.youtube.com/watch?v=RWxd9X2bKfo