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You say that like there is some group of people that decides this. There is no such thing, advancement in technology happens when someone has a good idea and that good idea is then proven and adopted. The current generation of web services includes RESTful webservices for example. Who knows what someone can come up with in the future?
Search for the problems/issues with web services.
Based on my experience, SOAP/WSDL web services didn't gain significant popularity as expected. For developers, setting up even something like security (WS-Security, WS-SecurityPolicy) can be a quite tedious task. Many specs tend to be perfect and full in scope. But learning is not so easy.
This doesn't mean that they are not used, they are used extensively. But they continue to be things many developers are not finding time to learn and use.
Recently, I have seen some discussions indicating that people talk about manageability and governance. They are much related to SOA than integration with web services.