Viewing angle applies to the entire screen, so given a fixed viewing distance a bigger screen will have even more issues. So say you sit to the left of the TV if you get a bigger screen the right side of the screen now becomes more off angle to you, sure the left side is now closer to you and less of an angle but the right side is worse. The center of the screen however remains the same angle to you so you now have a more un-uniform screen.How????
Let me tell you that with larger TV the Off Axis Issue is very less. Me sitting in my Hall I had 32" CRT long ago upgraded to 46" LCD and then to 65" LED. In all the cases the Seating arrangement was fixed. And the Seating to sides got the 32" CRT and 46" LCD to be Off axis but the 65" LED has wider coverage and hence the image aspect to viewing angle is less Off axis. And no the colors are perfect on my X930E even when viewed from Side seating Position. The issue arises when I am Off axis and only less than 4ft away from TV. But No one is going to sit 4ft close to 65" TV at Off axis. At 5-6ft away and Off axis where my Seating Position is there is No issue at all.
And I just cant imagine a Hall where TV is placed on a Wall with Wide Orientation. And the seating arrangement where side seats are on the extreme ends of the Room. The Larger the TV less is the issue. And if some one says that they have their seating just 5feet away from 75" or 85" TV then that is only applicable to the 0.01% which I was talking about. No one gets such a huge TV and sits that close to it. Size of the Room and seating distance should be considered when Purchasing TV.
Another issue is with large screen if sit close enough to a screen with a poor viewing angle even sitting dead center the edges of the screen are going to be at a steep angle to you so only the center of the screen will look good.
The one saving grace for a large TV is typically people sit further back from a large TV, and that will reduce the angle viewers off center will be to the screen.