I think it's somewhat unlikely punters are going to jump at 802.11ac routers unless/until there's a sufficient groundswell of products which would connect to them. And we're not just talking about laptops with dongles any more - phones, tablets, media streamers, consoles, remote controls even. All stuff that uses B/G and or N, which isn't easily upgradeable like your average PC.
It's a bit chicken and the egg though - nobody will buy the routers without the clients and nobody will make clients until there's an established demand through people having routers.
As a bare minimum, the routers have to be backwards compatible and even then you're talking about several years of natural wastage of equipment before the new .ac compatible kit achieves critical mass. By which point of course home broadband will have moved on again...
Basically put, there needs to be something more than the 'ooh, shiny' about it for it to get adopted in anything less than geological time. I don't really hear a lot of people complaining about how their home wifi isn't speedy enough, and most people right now are too skint to think about upgrading their entire wifi setup for what may not immediately be an obvious benefit.
It strikes me a bit like 3D telly. Yes, at a technical level there is a USP there. But I think they're going to have a hard time convincing people their current kit isn't 'good enough'.