Correct. If you're already writing a bunch of JavaScript for the client-side, then just think about this approach as migrating some of that client, UI logic to the server.
No. Any thick client architecture has to deal with this problem. The current resource-oriented models (by which I mean they're focused on serving http resources) are severely limiting those of us who want to develop a web application.
Some people are side-stepping the issue by saying that the whole presentation layer must be moved to the front-end, but that approach is really incompatible with the web.
If anything, the current state of the front-end is thanks to server-side developers who want to bring their world view to the browser. (Think: MVC -> Backbone / Ruby -> Coffeescript -- apologies to the authors of those tools)