Sometimes I think companies are just too afraid of consumer opinion to simply "pull off the Band-Aid". Every transition is hard, no one likes change that much, but when it's for the best - as is the case - there must be some more forceful ways to foster change. Imagine if we were all still in the era of parallel ports?
It's a shame Apple won't fully embrace USB-C, too. Not only they have great influence on the market as a whole, they were also - at least at the time Jobs was alive - unafraid to foster change by any means necessary. I still remember the cries when they removed DVD slots from their computers, and when they changed the connector on iPods, iPhones and iPads. They knew that some customers would be angry for a while, and there's nothing they could do about it if they want to change. Alas, Jobs is not here anymore, and it seems the current management is not as keen on taking those leaps as he was.
In the end, the tech is still a little more expensive because adoption is still not that great, which causes a vicious circle.