
I was going to say things would be so much easier if all the operators just had to share spectrum and were allocated it on a dynamic basis based on the number of concurrent users...
After all, train companies don't insist on having their own lines put down, then refuse to let others use them.
However.....the rail situation just shows that if they DID do this, the go-between would just be a massive money sink that buried everything in red-tape...and everybody's bills would go up to pay for all the new administrators...