WiFi is a pain point for most people so I suspect there will be a lot of interest. Actual uptake will depend on pricing. They list some actual certifications for Lennar where they used a wired backbone with a Brocade switch and two Ruckus access points. Maybe a $5K option on a $400K+ house? Since it gets folded into the purchase price, I could see it being popular option.
A more interesting question for me is support. Is it like your HVAC system where you are pretty much on your own, but HVAC contractors are somewhat plentiful, or will Lennar funnel people to an HA or networking company for support? Continuing with that, would there be an upgrade service when technology changed? Who is going to provide the boots on the ground needed for on-site support? Which will be the most successful business model: purchase (like HVAC) or service (cable TV/ISP model)?