This would be a completely and utterly terrible idea. People that do not mine for profit can buy some crappy usb sticks and do it without having to open their computer.

There is nothing to gain by doing that. The whole point of an ASIC is to allocate the burden of work to a microprocessor that is specifically design to do that work efficiently and fast (thus the name). Why connect a board of ASIC chips to a computer when a small ARM processor is more than enough to fetch and submit work over the network?