I was wondering:
Having your USB-C port replace everything limits like crazy atm?
The best you can have for now is 3.1 Gen2 right? Thunderbolt over type-C hasn't been done yet?
USB-C 3.1 Gen 2 even drive a #4K
The Macbook only uses Gen 1, so 5Gbps. It can drive 4k/30hz displays over HDMI 1.4b (which sucks, that's why I'm saving for a new graphics card). We don't know if it's full 4/4/4. Why I think it isn't becomes clear below.
Doubeling the Bandwith should be able to drive double the images of the same resolution, so 4k/60hz should be possible. (I don't know how though, seeing as HDMI 2.0 is supposed to have ~13-15Gbps)
But what if you get home to your 4K monitor for office stuff (which does make sense), plug it in and want to transfer stuff onto your PSSD, which usually takes 5Gbps alone (Samsung T1 does).
I mean, the Macbook doesn't drive any of that anyway, and I think that is a huge design flaw. It's a 1500€ laptop in the base version. It should drive high level office use cases. I'm not arguing for gaming here, just basic stuff, .pdfs, excel sheets etc. 4K monitors and TVs are available for quite a while, even I have one.
I mean, you can wait until the next iteration, but the thing is, it doesn't seem to get better, Gen 2 is still way too slow. A thunderbolt solution with 20Gbps has to be the next step.
You could do it with skylake over more ports in theory I guess, but then it's still two cables for the display and everything else, and it's still not clear if one Gen 2 C port can drive 3860x2160 60hz 4:4:4.
Most people won't use all that bandwidth, that is true, so you can actually have most people use one adapter at home that plugs into their laptop and have something of a decent dockingstation. But only one port in an expensive notebook? We're not there yet, not by far.