The bottleneck of anyones network is always the connection to the ISP. As long as they get 2 up then this will still work to minimise lag on the LAN and optimise the apps and devices on the LAN WiFi has its place but even the new AC protocol is still based on a signal and signals can be distorted to any degree by any electromagnetic source. TCPIP just does a better job of covering lost packets and slowdowns in the signal. Online PvP games are not on the WiFi list