Yes, most of the apps I so now, the UI is completely client side, with the app getting data via REST services, one of the last areas that can be a pain, is in content templating, what tiles and velocity do in the JSP world. What I would like to see is a CMS that provides that kind of templating for people who do not use server side frameworks anymore. I would like to see it publish to flat files because I think CDN's could then be used to bring in scalability on demand at inexpensive costs.