I think the argument is that with "single page applications" you duplicate a lot of your business logic in fat clients. This thinking is essentially a return to

I think the argument is that with "single page applications" you duplicate a lot of your business logic in fat clients. This thinking is essentially a return to circa 2004 but with today's APIs like websockets. I think you will see applications that are quite generic (look and feel) and very chatty, but quick to develop.