said by FFH5:
Franchises became non-exclusive by law years ago. So no cable company is protected from competition.
Even if Franchises are no longer exclusive, there is the problem that the cost of wiring an area that already has coverage makes the attempt not cost effective. The old company has the benefit of their having wired the area when they were exclusive and thus has a major advantage. The only possible solution is to make the "Last Mile" a separate company who sells access to ANY Cable Company who wants to service the area.