If everyone has unmetered gigabit, technologies like Tor and Freenet become significantly more usable. Rather than trusting my ISP, I'd rather use technologies that make it impossible for my ISP to violate my privacy expectations. Which would you rather have, "we promise we won't" or "we couldn't if we wanted to"?

("like Tor", but not exactly Tor since pervasive fiber from one provider would break Tor's threat model by allowing traffic analysis.)