as potentially impressive as a 90" LCD would be, without 4k resolution, I think it's going to be lacking. especially with 3D on board. I love the idea of larger and larger screen sizes, but at what point does size outpace 1080p? there has to be a point of diminishing returns with regard to screen real estate 1080p resolution. I think the 4k revolution really needs to begin in a big way, no pun intended. there are only a few 4k models announced, but if it doesn't become a standard I think all of these massively sized screens will be wasted and viewing quality will drop. we will really see this when LG or Sharp finally do drop 4k sets later this year or next.
just looking at the numbers between a sharp 60" to 90" tv, its a difference of 26" in width and 14.5" in height. that has to have a serious impact on pixel density.