Lol, carriers will never EVER willingly became "simple internet providers". EVER. They will scream and fight to the last dollar for their "right" to provide monopolized "services" - separate voice traffic, separate plaintext traffic, separate image traffic, and other "services". They'll cut and limit all generic internet connections, they'll filter unwanted packets (VoIP, iMessage etc.), they'll reroute traffic through their internal resources and inject ADs or spyware. They'll do lots of thing, except of cource becoming ISP.