Re: Web app? No thanks.
"Given that a lot of apps are just a webview that talks REST to an http server I think it is a reasonable claim."
No it's not. REST has nothing to do with rendering, ps scheduling or even simple things like FS access or user perms. REST is a glorified, text based transmission for web APIs that are _NOT_ built on web apps. As the article describes, the new ones will still C/C++ and in Chrome only, as most other browsers reject most of Chrome's new API "standards".
All that said, yes you can put apps on the web, but once you cross the boundaries of application from a simple calendar to a spreadsheet editor, you notice the creep (good luck with WebGL, it just isn't happening). The only exception would be serving static frames in a web app for something like video chat, just don't make that chat interactive like a game.