I don't see USB-A going anywhere in the next decade or so, especially now that they're popping up in wall outlets and power strips alongside traditional wall plugs (at least here in the US; YMMV elsewhere). Hell, I was at a casino last weekend and pretty much every slot machine has a USB-A port specifically for charging phones (unfortunately, the casino's gift shop was sold out of USB-C and Lightning, but had lots of micro-B on hand - go figure lol).