Why not just use the javascript and DOM there as well, and then have stuff like associated accounts and user data pre-processed transparently so that the developer wont have to even think about it?

In accordance with this point of view, Aptana looks kinda cool.

Now, I understand that various developers want their particular language, like python or java or whatever, but the web parses it all as html + javascript anyway in the end, so at some point these developers will have to learn it and learn it good, or forever be ‘hacks’ on the web.

Either we change the rules of the game in the browser to move ahead, or we change the rules of the game on the server to move ahead, and since all of the web is html, I’m guessing that the server is the most likely part to yield.
And here I think javascript is unavoidable..

When we moved ahead with web 2.0, it was javascript that lead the way with Ajax.
Previously, before that, it was DHTML.
That in turn was made possible by CSS.
Every time the web has changed in any major, lasting, way, it’s been closely intergrated with what came before it, be it css, xml, or xhtml.
I think that Chrome and V8 is along those lines too, continuously building on what came before.

I expect this to move forward along the same lines, because it has sofar.
The server world today doesn’t fit, and thus my conclusion is that at some point this will have to change.