A spec was set last September to encapsulate DisplayPort inside a USB-C to USB-C cable, just like Thunderbolt encapsulated DisplayPort, so we'll likely see some of that in future monitors as well.
The power persists
Thunderbolt isn't dead and USB-C doesn't look like it's going to kill it off soon. Indeed, it seems likely that USB-C will wind up replacing ports on consumer-leaning Macs, like future MacBooks (if 12-inch isn't the only model), Mac minis, and iMacs, while the Mac Pro and MacBook Pro will probably retain Thunderbolt for the highest performance with external drives and other peripherals.
If you're dead set on buying a USB-C machine, make sure you know what you're getting into--especially if you use your laptop as a fully appointed portable workstation like I do. Before ordering, you need to make sure the particular multi-prong adapters you'll need are available, compatible, and affordable.
It could be that Apple is signaling the post-peripheral era, appealing to a new majority of users who really only need USB to charge their machines. The current MacBook's SD Card slot is of little use to an iPhone photographer, for instance.
And with more than 9 hours of battery life, many mobile-first users can comfortably give up their single do-everything USB-C port when they need USB connectivity for, say, a thumb drive. Sure, that USB-C port is also your lifeline to charging power. But the definition of "power" user could be about to change.
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