Having thought this over more, i'll get 4k when it is ubiquitous in the living room - in my opinion , that will not happen for at least 2-3 years and will require prices to drop fairly substantially. If UHDTV's lower to reasonable price levels, PC 4k screens will follow but NOT until then. So it really is pretty ridiculous to pay 3500$ for a good 4k PC screen when 4k UHDTVs will probably be around the 1500$ mark 3 years from now...
I do see 4k being mass adopted at some point. It will happen, guaranteed - the new HDTV standard is based on it. The only variable preventing mass acceptable at this point is price, and that will slowly lower over time just like it did with 1080p. People were hesitant to adopt 1080p at release too due to price, but that slowly fixed itself over time. Same will happen with 4k. So i'm not too concerned about 4k until it becomes ubiquitous. And that isn't happening in the next year.