What we mainly learn from this diagram is a) my path to the bathroom is a long, circuitous one, and b) the 'circo' program from graphviz is pretty fun, and c) the hallway is some kind of communication nexus.
On a system that started off with ~80 Mbps of TCP throughput (which is about right for a 2x2 radio at 20 MHz... too bad it's a 3x3 radio though), using the mesh I was able to still sustain 14 Mbps from a distance of about 114 AnandSteps. That's about a 6x decline, or about 3 hops at 50% signal power.
By my rough calculation, that means a 4x4 radio @ 80 MHz should be able to do 14 Mbps * 2 * 4 = 112 Mbps at that distance, which comes out to about 5 TVs (and absolutely no bandwidth leftover for a safety margin or actually using wifi for Internet traffic).
On the other hand, 114 AnandSteps in linear distance is, hmm, maybe 250 feet, which would be a 62,500 sq.ft. one-story house. Which is maybe unreasonably large. (It would also need more than 8 mesh nodes to properly cover the whole area, but in theory could still connect any two points in about 3 hops.)
With only two hops (more reasonable for a reasonably-sized home), speeds were around 35 Mbps, so the 4x4 @ 80 equivalent would be about 280 Mbps, which seems to leave plenty of room for TVs and Internet.
Disclaimer: these estimates are extremely rough.