At least here in the US I think that many will be driven to Web3 due to all the various forms of censorship on the Web2 platforms. Personally, I want to be involved in Web4 by the time 'the masses' begin flooding into the Web3 spaces.
I am not sure what Web 4.0 will be but it is interesting to think about. If we are using timeline, that certainly could be in the next 15-20 years.
I am not completely sure either but I have some ideas for it. Gonna be holding those cards close to my chest though. I am slowly learning not to share all my ideas. I was thinking more like the next five to ten years before its infancy but fifteen to twenty is probably more accurate.