The problem isn't so much that Comcast et al. want to offer packages 3, 4, and 5, it's that they want to discontinue packages 1 and 2 and replace them with crippled packages at the same price, with premium charges for YouTube, etc.

"Why should bandwidth hogging protocol users hog all the bandwidth?" Why don't ISPs simply charge by the megabyte, so that by the time they have too many bandwidth hogs on their network, they're bringing in enough money to afford network upgrades? "Bandwidth" isn't some fixed resource. If there's demand for more, the suppliers can provide more by either laying extra cables or upgrading the equipment at the ends of their fibers, and this kind of reaction can happen on the timescale of months, which makes it pretty fluid given that consumers also pay by the month.