Alan Kay's idea was (paraphrasing) "It's great that we have message passing between client and server processes, but we really needed to take this idea and run with it, with each piece of content on the Web being some sort of network-hosted process which you communicated with. Then you by-default preserve provenance (who the author is and how it got here) and then you can integrate micropayments into browsers so that you can earn money for watching ads (and target the ads that you want to watch!) and then use that money to browse the content that you want to watch, etc., with by-default the content-creator reaping the micropayments of their content."
But because nobody solved this rather difficult problem, we have freebooting and you have to reload web pages whenever you change their source and re-navigate down to the menu that you care about, and Brendan Eich is now getting flak from people for trying to reinvent advertising on the internet etc...