The market is strongly ignoring even 70" TV at this point; I'm not clear why people are again bullish on even bigger screens. Sharp's 70" sets are even cheaper in year 2 but are poised to manage <0.2% of the global TV market in 2012. Obviously, this could grow over time. But it's not like some sort of technical revolution change the equation. I mean it's simply bigger TV. And buyers are staying away in droves.
There is no difference in HDMI cables. If you can see the picture without visible dropouts or sparklies, the cable is working at 100%. No other cable will display a better version of that picture. You're simply wrong if you think there is a better digital cable than one that is already working.