This time's a bit different though. Not only are we talking about double the resolution again (so an exponential increase), the frame rate has to go up too, else you get screen tearing. When HD first came out, it didn't stretch the current limits of hard drive technology, nor was it really a massive leap for PC monitors to meet the new resolution.
Yes the market will adapt, but the chances of it happening as fast as it did for 1080p are extremely low. 4K is going to be the next big thing for quite a while yet.