Sorry, but you can not always simply change. You saying it does not make it true.
I can change providers this afternoon if I choose. If a person lives in an area with a single provider with poor service, a competitor will rush to take advantage. This is exactly what happened in my town with Time Warner and ATT. Internet speeds have never been faster or cheaper for me. If you choose to be wilfully ignorant of the way a free market works, do so at your own peril.