The world will transition to USB-C sooner or later. It's not a new port that Apple invented. It's something that Apple has agreed to comply with in order to be a part of the universal standard. They just happen to want to leap into it much faster/sooner/more aggressive than others.
The problem is... the market won't catch up fast enough.
Case in point: USB 3.0 has been around for... how long? Considering that it's using the good ol' USB type A connector from way back, there was no problem with backward compatibility.
Now count how many USB 3.0 devices there are on the market. No, seriously, please do try to count them.
Then count how many Thunderbolt devices there are on the market, and realize just how long Thunderbolt has been around?
Please do also note that Thunderbolt was an open standard that other manufacturers could have adopted as well.
There is literally no native USB-C device on the market right now. Zero.
There are docks that might as well have been retooled Thunderbolt or USB 3.0 docks with pass-through power selling for a hefty premium if you really want to count those. Plus batteries. Plus some displays that, again, may well have been retooled Thunderbolt displays.
And if I have to wait 2, 3, or 4 more years to just barely see more devices on the market that I can use with my Macbook from... today, then why don't I just keep using my older Macbook until 4 years later? Or why don't I get one of those other devices that offer USB-C connectivity in conjunction with a multitude of other more regularly used ports?
Should Apple care? Technically no. They are making good money as usual, because there are those who buy into the promise rather than the utility. But at the same time, there are more of us now who see that the promise simply could not and cannot be fulfilled, and we are left wondering if we should keep investing.
I see Apple as having taken a long hard fall now after Mr. Cook took over. He is lacking the execution that Steve Jobs did. Simplicity is key, yes, but reductionism does not necessarily lead to simplicity (case in point: all of those with USB-C-only Macbooks have to live with dongles and adapters for at least one more year, whereas those of us who stuck to the last generation don't have to). This is a key concept in computing that I think some do not get.
Simplicity right now is simple: I go home, place my Macbook on the table, swipe the power cable over and it snaps into place, charging the computer. When I go out, I simply close the computer and just lift it away from the table, the power cable gently detaches itself, and I can tug the computer away. When I get to work, I just need to insert the Macbook into my Hengedock and I'm good to go. Everything is connected. When it's time to go home, I just detach the Macbook from the Hengedock.
So clearly, I don't seem to need USB-C right now with that dock. In fact, I'm seeing the inverse: people now need docks for their USB-C devices. So what problem was it supposed to solve again?