Minor correction, but it's the Macbook with one port, not the Air. The Air that is still available has two USB and one Thunderbolt port + an SD slot and the Magsafe connector and so on.
And quite honestly, the single port Macbook isn't a completely horrible idea, Apple is just trying to push a new standard like they always do. It's an entry level computer that does just the basics. How many peripherals are necessary on a computer with those specs? You certainly can't do any games on it, most printers nowadays have a wireless function to connect to, it has Apple's trackpad which is pretty darn good for navigation, else it has Bluetooth for external mice, which can be had for very cheap now with good performance.
I'm all for more options; I don't have a Macbook because my old 2012 Macbook Air feels about right to me in terms of minimalist form with enough function to still do what I want. But I can see how you'd work with a Macbook without running into issues with the port. The majority of the time I use my laptop is just having it plugged in, or I have it when I'm traveling and don't want a bunch of stuff plugged in anyways.
Apple's idea isn't far off from how most people use the laptop.