I would keep an eye on the prices. They are starting to fall towards more cost affordable.

We have a 8 year old Panasonic Plasma that is still going strong. I keep watching the prices on the 4k units. When the Plasma dies, I am going with at least a 60" to replace the 42".

Football is really the only thing that my wife would like it for. It is going to be a while before you see anything other than the Olympics in 4k. But it is better to be ready.

Also keep reading up on the graphics cards and games. The games are slowly coming out with higher resolution, as consumers buy more of the 4k capable cards.