They already have. Witness the Macbook with ONE lousy USB-C port that has to be used for power as well as all connections. ONE port without a hub = disaster. But they claim in order to make that thin, they can't fit another port on there. Why include a headphone jack either? Just pretend you have sound or listen to tinny crap speakers that it comes with....
And what they call a "headphone" jack is also really the "line out" for most computer speakers. In other words, if you're going to "dock" with actual decent speakers, you need some kind of line connection. You can either buy a hub that comes with one or buy a professional audio output interface (although those were easier to connect in the days of having actual Firewire ports; now you need either a standard USB jack or adapter for USB-C or a Thunderbolt jack (not sure if USB3.x is low enough latency for a pro port or not. It's why I used Firewire on my MBP when I wrote songs).
Bluetooth is unacceptable for live connections. You need low latency. Even my Mac Mini is connected to my Klipsch 2.1 computer speakers via the so-called "headphone" jack.
Apple would really like you to buy some Beats headphones instead, though.... Maybe their sales aren't what they expected them to be. Some of us know quality headphones and they aren't them.
apple is making a wi-fi smart speaker (ala amazon's echo).
that's what you're going to dock to.
--------
on a sidenote, it's weird (not really) how all the negativeNancys will say "apple is so stupid.. so much cable clutter" when whining about mac pro.. then when apple removes a port, it's "apple is so stupid.. wires are good"