After two world wars, people assumed the future would be wars of tremendous destruction.
When aviation was growing fast, people assumed the future would be flying everything.
During the space race, people assumed the future would be space everything.
During the growth of nuclear power, people assumed the future would be atomic powered everything.
This fails to match reality, because the future doesn't arrive as if we are barreling down a highway at an ever increasing speed. Advances tend to be a left turn down a road you couldn't reach before. Rather than building ever faster jets, we went to space. Rather than going further into space, we built communication satellites etc...
Our current 'Internet' age will be no different. The 'next big thing' will not be Internet v2, but it will be something that could only exist with the internet as a prerequisite.