So, all the tech we use that uses USB A will disappear in the next year? It's ok, I can just spend more money so my keyboard and mouse can work with my $2400 machine.
Get a USB-C to USB A adapter for the keyboard ($19 from Apple, less than $10 from others). My stuff is all plugged into a relatively new Thunderbolt dock, I'll get a $49 Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter.
USB-C is a better connector that can sweep away all the USB connector types that have come before. Products can't switch fast enough. I wish the iPhone 7 used it instead of Lightning but Lightning is thinner so they probably never will.