I really hope Apple isn't going to make this a trend across their line, and that others don't follow suit. That said, given that they made it a "new" line, I think it may have a place. e.g. for some moderate to high percentage of people that use a laptop they rarely or never plug anything into it. And those same people are usually the ones on the go a lot, so this might really have a good fit for those people (e.g. w…
I imagine that when monitors with USB-C hubs start being released, the one-port hassles will be reduced --particularly if the hubs include Ethernet ports and device charging-- at least for a significant percentage of developers.
But for the average person not doing that type of work, your right a simple hub in the monitor is an easy and fairly elegant solution. Effectively a docking station would also be a simple solution as likely the extra ports are not needed when on the go most of the time.