Yeah, wait till the price comes down
All that being said, lack of available content will make 4K adoption slower than HDTV. Many popular tv shows still only broadcast in 720p instead of 1080 so convincing cable companies to upgrade could be slower. The fact that the intense difference between 1080 and SD is more apparent than 4K and 1080 will slow the propagation of this high price tech as well.
I've never been a fan of 3D and loved 4K from the minute I heard it. My guess is we won't see 4K adoption become popular until close to 2020. I do know that the next tv I buy will be 4K, though my current tv is only 5 years old!