|Mike, I think you are faulting fiber optic for the failings of an entire system. The speed of any connection will only be as fast as the slowest part.|
Since the advent of cable TV and broad band internet, the issue has been for the hardware to catch up to the content. As computers got faster, things like the quality of the graphics improved dramatically. That negates much of the speed gains.
Fiber cable technology is only using a fraction of the capability. For one thing, fiber can compress packets just like cable does. I assume this still has more potential. The other thing that can be done is fiber can carry multiple wave lengths simultaneously. I don't think that is currently being done but is possible.
Additionally, the installation of fiber is the bulk of the cost. So installing a cable with more fibers can be cost effective. In short, fiber has all kinds of growth potential, as opposed to coax or wireless.
The issues you site are not caused by any limitation in fiber but in the other parts of the entire system. Most systems are using at least some fiber optic cable but few are using a completely closed fiber system. Even then, they are still connecting to slower technology somewhere in the loop.
Going back to multiple wavelengths of light in use together. I THINK, this is strictly an economic issue at this time. I assume it is cheaper to add more fiber than to complicate the technology by sending multiple threads of different color light simultaneously.