But my guess is you've thinking of your kids watching TV 20 hours a day.
That was my primary concern.
My other concern about tubes was the mention of a tube integrated amp. If it has tubes in the amp section, they do not last nearly as long as pre-amp tubes. Also, if it is left on all the time, or most of the time, there is some risk of fire while unattended. I know it's not necessarily a great risk, but I've read multiple posts over the year about burning tube amps.
I've had tube pre-amps, amps and integrated amps. Always like the SQ of tubes, but I'm done with bottles. I "settled" on a solid state integrated amp a few years ago and couldn't be happier.