Do you think that json will beat xml, and xml will be disapeared in history because of json?
No, XML will not go away. It is way too big in enterprise for that to happen.
What will happen, is that we will keep seeing it disappear from APIs and other relevant systems. The big BUT here, is that SOAP/XML will still be around on larger internal enterprise systems etc. but for most internet based services JSON will most probably take over.