Wow grandma, what big monitors you have.. Is this an HTPC application?
there's still almost no 4k video to speak of, so the only thing it will do is be a giant screen with tiny tiny writing on it. As for pricing It will go down, but how fast is hard to say. If some company gets some 4k content out there and folks start buying them as TVs the price will go down quickly.
dunno how useful that is though. :/