Why there are no manufactures making a 70" plasma? Have a SAMSUNG 58" plasma and its time to upgrade to 70",but all I can find are LCD/LED. Sent from my Nexus 7 using Tapatalk 4

My Samsung 58" Plasma is about 2 years old, and when viewing something bright white, very faint red lines appear on the right side of the screen, fanning out from the center (see linked photo). I haven't seen this specific issue anywhere on the web. I've tried replacing both y-buffer...

Like title says, does the PQ improve as the set ages? How quick? The next day the overall PQ seems to keep improving.