Whoaaaa.... Sorry but too long to read...
Maybe THIS will convince you:
1. Almost any phone uses USB 2.0
2. Phone's USB Speed is limited due to the USB speed not being the manufacturer's priority (Ever been annoyed about the slow transfer speed of files to your PC?)
3. 2.4 GHz Wifi already gives you 54 to 160Bit/s.
That's a speed, you'll NEVER get through your USB connection.
Be really happy if you get 40 MBit/s...
4. There are... like no wifi routers which support 5GHz only.
5. There are no Laptops without any wifi except in a museum or in the big spare parts box in my garage.
Who'll buy it?
1. People who don't have wifi in their notebook?
No, they sit in a museum or they just use regular USB tethering.
2. People who want faster network connection?
No, cause it won't get faster.
3. People who are in an area with 5GHz wifi only?
No, 5Ghz only makes no sense due to its bad signal through walls. This just doesn't exist.
4. People with old hardware who have a broken wifi chip in their notebook and who can't afford a dongle?
They would use regular USB tethering. If they can't afford a dongle, they can't afford your app.
5. People with very few space in their pockets, to few to carry a thumb sized wifi dongle?
No, they use Bluetooth Tethering. They probably also have a wireless charging phone cause they also don't like to carry a cable.
6. People who are allergic to Wifi dongles or who are forbidden to buy them by their religion because the dongles aren't approved by their guru whereas mobile phones are?
Nooo, they just use regular USB Tethering. They live in the guru's house, they may not leave it, so no point in having an easier way to change the wifi network. Besides, the only laptop in the guru's home is his own, cause his followers may use the internet only once a week, so one notebook is enough for the whole lot. And Guru is rich enough to have a new notebook with integrated 5 GHz Wifi.
AND FINALLY: HOW OFTEN A DAY DO YOU CHANGE YOUR WIFI NETWORK?
ONCE OR TWICE
Use regular USB tethering and pick your fnjörpliging phone up to change the network, there's absolutely no need to have an app for that!
So, I had very much fun trolling you with facts! I even got to make a joke about a funny made-up religion.
I'm outta here