Fair enough.
We moved from a 28" CRT to a 40" LCD and now to a 43" which is big enough for us. We don't need 4K either (especially at that size), but at the price, we thought it a good idea to future-proof, just in case we end up with some source that is 4K only in the next few years.
If we had another room specifically for TV/Audio, we would probably have gone considerably bigger.
SteveW