Is AJAX just a transitional technology?

On the CSDN homepage, I wrote the title "who is the hero of AJAX, Flash or WPF?", and listed the Flex 2.0 force Ajax launched by Adobe below, and Yuan honggang's article Ajax in August is just a transitional technology. In his article, Yuan said, "Ajax is actually a transitional technology with a new bottle of old wine, we believe that it will be replaced by new technologies in the next one to two years, while JSF is a scalable framework-level solution."
 

Since the fire last year, AJAX has not been replaced, but has become increasingly popular: all major websites are competing to use AJAX technology, it seems that any website that does not use AJAX is obviously outdated, from Google to Yahoo, as well as various portal websites in China. Without AJAX technology, it seems that Web is not enough; various AJAX frameworks are also surging, Microsoft's ASP. net ajax, Yahoo! of Yahoo! UI, Google's Web Toolkit, dojo, prototype, and so on; then, let's look at the degree of attention of friends in the garden to AJAX, far beyond the attention of other technologies.

So what is the fate of AJAX? Is it just a transitional technology? Can it be replaced by Flex or WPF? Let's have a discussion. Let's talk about what we think.