4K (or even 1080P) quality is unnecessary anyway. Not too long ago, the best quality movie you could rent or buy was on DVD and those are 720P. Nobody complained back then...
Hard to tell if you're being serious or not, and maybe you should define necessary. Based on your comment I would guess you're still using a 32" Sony WEGA for entertainment, which is fine... but bear in mind most have moved up to a 65" or larger.