[olmideso]

I think it's unlikely that everything you mentioned will be gone: Web browsers - right now there is a trend towards unification and open source because the software is just to complex to build and maintain for most companies and I expect this will continue in the future. So we will have either same browsers(i.e. Chromium, Firefox) or some derivatives/forks.

Windows - this one definitely not going anywhere, there is just too much software built for it. Windows 7 which was last updated 6 years ago is still widely used. So there are no premises that Windows 10 or its successors is any different.

JavaScript - while currenty popular frameworks are quite likely to disappear and their best practices and functionality incorporated into the language, the core language is unlikely to go anywhere. Even things like WebAssembly are developed as a complementary part to JS, not as a replacement. Maybe we will see a wider adoption of things like Typescript, but JS still will be underneath them.