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Luckily DOCSIS3 scales pretty well. You can just keep adding bonded channels. 4 or 8 channel D3 modems are common these days but we have 16 and 32 channel models waiting in the wings. Since cable systems aren't exactly symmetrical from a spectrum standpoint the upstream speeds will continue to lag a bit but 25-50Mbit/sec is do-able today. 50-100Mbit will probably be common in 5 years.

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I'm curious about why the artificial limit? The cable cos have enough backbone bandwidth, right? So why can't they just add channels and sell 100mbps+ today?

Some companies do offer 100Mbit packages today however it's mostly a gimmick. They would face a much bigger challenge/cost to offer every single customer 100Mbit. There's a surprising lack of demand for customers who are willing to pay more for faster speeds. It seems the $50 or less per month price point is what people want.

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