What's too big for a home television

Its finally time to replace our flatscreen TV. Its a 50" which is small, but when our 55" died my sister was upgrading her t.v and gave us this one to get by with and save some money. Several years later it's been a good t.v, but is done. Bands of pixels burned out many bands, lol. Wife said pick a t.v that's reasonable in size. She thinks 65", I say 75". Lol, we have the space, so that's not an issue. What is too big for sensible use?