One should not simply assume that the creation of fast lanes of dedicated bandwidth forces everyone else who chooses not to pay ISPs, or cannot pay ISPs, into slow lanes. While those lanes may be slower than the fast lanes, they were slower with or without the fast lanes.
And if bandwidth-heavy traffic that would have traveled over the open Internet (adding to congestion) is offloaded onto a separate fast lane that does not impair the preexisting pipe’s bandwidth capabilities, it should actually ease congestion on the existing lanes, rather than create slow lanes.