Yeah, all my audio equipment (keyboards, controllers, interface) is USB A and I don't see producers switching en masse (and even if they do, do I really want to throw away my favorite keytar?). The only exception is Roli block but Roli is kinda meh - fun to play every once in a while but not something I'd like to use every day to lay bass track or piano chords. I've disabled a ton of various background stuff like Siri but this setup is still flakey. If I were trying to make money on my music I'd be really pissed now.
I think all my musical equipment has a USB-B port on them, work over USB 2.0, and I've got like a dozen USB-A/USB-B cables around. Those plug into every other computing device in my house except new Macbooks (and iPads, but, Lightning to USB-A adapter, so, still USB-A, and notably I can't share that adapter with a Macbook because Apple's approach to this has been a bizarre mix of foot-dragging and waffling on the iDevice side while running way ahead of the pack on the other). My enthusiasm level for buying new cables or adapters only for fairly new Macbooks when any other new computing device I buy would still have USB-A ports, and then have them maybe not work anyway because USB-C compatibility and cable/adapter quality is a shit-show, is exactly zero.
And I'm not made of money and I have other hobbies that require cash so I buy used musical equipment so I can get low-end pro gear a generation or two old for at or under new prices for amateur/crappy gear. There's little chance I'll buy any USB-C native musical equipment of any kind before 2030 or so. Who's cycling out all their gear—musical or otherwise—so fast that dropping USB-A and HDMI entirely in 2016, on a "pro" laptop, made any damn sense?
You do know that all you have to do is buy a USB-B to USB-C cable and you can connect your existing equipment to your Macbook, right? I mean it sucks that the new Macbooks have so few USB-C ports, but there's nothing preventing you from plugging in all of the older USB-A/B/micro/etc equipment directly into it as long as you buy the correct $5 cable with a USB-C connector on the other end. No dongles necessary.
