The only proponents seem to be leading edge companies with the talent, time and vision to make the leap. Yet, these users have still had to build monitoring and management tools. As a result, it is difficult for managers of mid-sized projects to understand the problem, the alternative strategies and the resources and commitment required. Weapon One solution is to roll your own. Microsoft did us all a great favor with WinSock.
Sockets are everywhere now.
The infrastructure is there for you to build on and to create server applications based on direct communications with clients. The entry cost in terms of investment in tools and software is practically nil. You probably have everything you need to get started today. You gain control over the deployment of functions across servers and clients. If you choose to roll your own application, be prepared to manage threads, security and version control yourself.