Nice if you have a lot of devices, but if you have only a couple that need high speeds, a waste. The internet isn't going to be running 4.8GB any time soon, so the speed increase only gives you faster device to device connections, or more connections. You can have 250 people all watching video streams, but how many files can you download while watching 2 streams (if it's only you)? Even if you watch a stream while downloading 4 or 5 large files, 802.11 n, or WiFi 4, is probably fast enough. Smart devices? They don't use much data, so even if you have 10 of them in your house, that doesn't equal 1 video stream.
And WiFi-7 will be here around 2023.