You seem to be under the misimpression that I'm talking about a network where every device on the network is connected to the same single router at the edge and if you just get a gigabit all-in-one router your problems are solved because there is just one device to upgrade. That's not what I'm discussing here. I'm discussing people who may have something like this:
WAN ---- Router ----- Switch --- Switch ---- Access Point
|
Switch ---- Access Point
|
Powerline Device ----- Powerline Device ---- Access Point
Etc