So? Generally you are either at a desk (often with a display, keyboard, and mouse), or you are traveling lighter and don't need to connect many usb devices.
So for each desk get a widget that takes a tb3/usb-c connection and connects to your mouse/monitor/keyboard.
Basically an instant dock. If you really hook up more than one device, travel light, AND need more than 10 hours a day buy a little usb hub.
I suspect over 95% of laptop use is either at a desk or requires less than 2 USB-C/tb3 ports.
Nowadays, TB2 hubs are not cheap (200-300 EUR) and I don't expect TB3 to be cheap either. Just USB3 hub does not cut it, it will be a while until you will be able to connect displays using USB3.
Even today, I'm using two TB2 ports and one USB port (i.e. three ports on the computer) because: 1 x miniDP (no, most displays are not TB2 native and cannot daisy-chain with other TB devices), 1 x ethernet adapter (the Apple one cannot daisy-chain either), and USB hub for the rest.
New (granted not quite shipping) hubs/docks sound like $100 or so. You sit down, connect the tb3/usbc cable and your mouse, keyboard, and display works. Of course your laptop is getting charged as well.