+John Carl Villanueva +Matthew Ross
Not true at all. For starters, even a basic 150-N router is going to be faster than almost everyone in America's home internet connection. Most personal speeds top out at 50-100Mbps, and that's usually pretty expensive, so your internet will still be the bottleneck, not your Wi-Fi.
Switches act the exact same way in wireless routers as wired, and it doesn't really matter whether you are splitting by time share or bandwidth, every added device still takes maximum capacity from the others. Of course, this is beside the point in a practical matter, because the internet connection is still a much bigger problem for most people than lan speed.