What was really cool with the 4k is that I could get literally 2 inches from the screen and still not see the pixels. It still looked natural even at that distance.

I don't really know why everyone assumes that a large screen must be a TV. Projectors are really inexpensive compared to large televisions and allow for a LOT larger image sizes. Brightness and lamp life problems are also largely a thing of the past. I have a three and half year old ~900€ full HD projector (Benq W1000+) and would not even consider going back to a (relatively) tiny and expensive TV.

I think everyone will have relatively large 4k displays eventually, but can't imagine paying 2-3x the cost (for now) for something that is only 60-70". I doubt you could tell the difference for movies/TVs unless they were side by side at that size (or you were sitting a only a few feet away). As a computer monitor though, it's a huge difference I think.