Network Design. DSL can't compete on Speed or availability, and Telco's don't seem to be doing much to expand offerings.
I Love my DSL but Time Warner offers 50/5 in my area now. Sooner or later I'll end up switching just to have the higher speed.
Wireless may be the future of profits, but Fiber is an investment that should be made at least NEAR peoples homes.
With fiber at their disposal the Telco would never have to worry about cable being faster.