The floppy drive died because a better option came out. If USB-C is truly better, than all new accessories would use it.
There needs to be a transition period where everyone has USB-C and USB-A so that the peripherals can naturally move to the better technology.
Right now I've never seed a good USB-C to USB-A converter. I work at a lot of conferences, and any time a speaker comes with a new MacBook and a USB adaptor, it's a disaster. They all suck.