That USB type-C strategy is for a laptop that is thinner than the Macbook Air. I don't think they will pull that trick for the normal Macbook Pro.
What trick? Of course they'll add USB type-C to MBP.
If you ask whether they'll keep regular USB or thunderbolt, perhaps but just for a few releases more. E.g. both could be gone by 2018.
That said, MPB will of course have > 1 USB C ports.
The trick - having only one connector. For normal macbooks they will probably have multiple USB-C (for power and other stuff), maybe one USB-B, a card reader, video etc.
http://hengedocks.com/pages/vertical-macbook-pro-retina
I've been doing quite fine with the DOCK as my 'need ethernet at my desktop' solution:
http://www.landingzone.net/products/for-the-macbook-pro/
I'm sure there are other options; it is a hassle that Apple removed it, but on the road I rarely need Ethernet, and at the desktop, its kind of easy to just plug-in.