I think it's great that Apple has replaced all those ports with USB-C, and as you point out it is exactly in line with previous decisions to prune almost obsolete tech which turned out very well. There will be a lot of unjustified moaning and then people will be happy when the whole world runs on USB-C (at last, one fast standard for connectors that everyone can agree on).

I'd rather have two USB-C ports though than a pointless little audio jack - they should have put one on either side as Google have on their pixel. People could use bluetooth headphones with it if they really couldn't find some other place for the headphone jack, but I'm sure they could have squeezed it in if they tried hard enough. As it is one port is rather limiting (yes I know it shares data and power).

It'd be nice to be able to charge an iphone and charge the computer at the same time, so on port means many people will require a hub. They should also have sorted out their monitors with a refresh which actually functions as a hub for USB-A and USB-C - perhaps they'll do that before launch or I hope soon after.