Monopoly doesn't pay to break speed limits
I don't believe that multi-tiered service levels for content providers will necessarily mean innovation and faster internet speeds. Telecom providers that manage our backbone internet services are virtual monopolies. I don't know of a single market where there are more than two choices of provider, playing a back-and-forth game of raising prices and giving low rates to those who switch. In our market the two providers are also the biggest provider of content, because they deliver television as well as internet service. As television and internet services merge into "on-demand" content, there is surely an incentive to speed up the telecom's internal network. If telecom provider content streams better, than why would you subscribe to anyone else's service. The owners of the pipes get the upgraded service for free, and the idea of free market competition goes out the window. It's bad enough already - this is just one way to shut independent competitors out of the market. The only possible challenger is Google, who is buying up fiber to offer true high-speed internet which magically comes without speed checks for content providers.
If telecoms provide a true, alternate network for high-speed delivery than they can probably avoid regulation, because it will operate as a separate service. As a technician, I know that to tier service, you must set specific speed caps for your pipes, and tiers are typically described by the telecoms as "up to" such-and-such a speed. The FCC will have a great deal of difficulty regulating the speed of the slow lane, but would have much less difficulty maintaining a level playing field for content providers, where any slow-downs would be a violation.
Let's say the Federal government steps in to break up the telecom / cable monopolies, separating content from delivery - then we might see true competition and fair markets - but who expects any anti-monopoly action these days? There's too much money to be made raking the consumer over the coals for the slowest internet on the block.