In the age of wireless are cables really needed?
For me the answer is of course. I have wireless everything but for playing games I have to use a wired keyboard, mouse and network connection to avoid "lag", meaning my main PC at home uses all 8 USB ports for various different things.
The thing is that what I tend to use instead of my laptop now is my iPad which also has a single port used both for charging and output to my monitor plus the head phone socket. I have not had a problem with this setup for the past 3 years. So I doubt the people buying the new macbook will not have much problem either...and if you can plug it into the USB slot in your car to charge all the better (I doubt this is possible due to current requirements but would be nice to find out)