For the people who were already working with WCF this feature is like: great for simple things I don't need to specify anything anymore. If we want to do more advanced things, we will still go for a full fledged web.config.
For the people who aren't experienced with WCF this feature is like: wow so that's how easy it is to create a WCF service. But if they need to do more advanced things. Will they not miss the basic concept of ABC and all the more advanced options that you
can set in WCF? They would still need to go on the web and do searches on these things.
So it's a great feature, no doubt about it but I think it will mostly be used to quickly setup a simple WCF service.