That's a legitimate concern but I have to say USB Type C is about as future proof as you can be at this point in time. So 2019, at least, is probably safe!

There were a lot of smart people working on that standard. In fact, amidst the uproar over the introduction of Apple's symmetrical Lightning cable and USB's opportunistic announcement that "Hey we're working on one too, honest!" people seemed to overlook that Apple had people working on the USB Type C committee as well.

But it's still too thick for charging my wireless earbuds so let's include type D mini... Or was that micro? So much for universal. USB has lost its way.