Bitcoin is like TCP/IP. Without it, no internet. The guys who wrote TCP/IP sure as hell didn't envision the internet the way it is today - no one can predict those kinds of innovations. They didn't see youtube, the world wide web, wikipedia, social networking, netflix, itunes, or cloud computing. What they did see was a basic protocol that connected everything in a redundant, decentralized way. That was all it took to change the world.
Agree...
Anyone who tells you how that vision is going to play out is kidding you or deluding themselves.
Disagree...
The designers and developers that are building on top of the bitcoin protocol (tcp/ip in your analogy) are driven by a vision. It is the pursue of that vision what makes and will make the ecosystem move forward. Nobody knows how will play out with a 100% of accuracy, but certainly most people is driving the direction with "their" vision and some of them will be damn right. Exciting things to come, we just need to give it time...
Now keep moving bitchez. Go build something.