I moved my most of network to ethernet over powerline using AV500 kit a few years ago, as the WiFi congestion was pretty bad around here and I was getting lots of drop outs streaming video etc. Cheap and effective, and works well. 75-85 megabit rock-solid transfer rates, tested transferring large files.
I still need WiFi for two phones and tablet. I have moved the phones to the 5GHz band, which works better but seems to lack range (the tablet won't do 5GHz). But I have just discovered powerline units that you can apparently set up as dual-band access points - connecting back to the router over powerline and extending the WiFi coverage. Two on order, so I will see how it goes for extending WiFi coverage when they arrive.