I personally feel and have noticed that most people (men) upgrade their tv around the World Cup Period. HDTVs became main stream around 2010 imo..
FIFA 2014 partners are already working on getting the matches broadcasted over 4K. So there will be grater push towards 4K ?
Back then in 2010, there wasn't much HD content but people upgraded just for the World Cup.
and to add on, more 4K Content is coming our way.
Netflix plans to release 4K content with House of Cards Season 2 due just 2 months away.
4K Netflix streaming launching next month | The Verge