Was just thinking that - rental flat share situations. If a flat doesn't come with a telly, and nobody owns one already, there might not be one there at all. I certainly wouldn't buy a telly for my (hypothetical) bastard flatmates to watch, that's for sure.
But people are renting for longer, certainly in London. I'd expect household TV ownership to slowly decline as the proportion of flat-shares to 'family homes' increases.
(No data for this but I'd buy it)