re: Enjoy the mute button while you still can
External speakers to get better sound anyway. Then have a remote for those. Mute as you wish.
Or: get a TV now, and fume like mad when it can't be muted. Besides, I've yet to see a TV be stymied by hte lowly power switch on the wall. Most adverts are for 3-4 minutes, so you can enjoy them that way
or: plug in a set of really cheap headphones are the right point, (perhaps you only need the jack to correctly stuff the system -- don't know about the electronics on that one), and your TV outputs to the headphones.
Personally the external speakers appeal. If they could remotely unmute my current TV I'd be impressed. it's not HD, heck, not even digital/the likes. I've got a CRT...
Bring on the X-rays
Oh, and back on topic. advertising should be mutable. I'd love a TV that you can blank when needed as I find that they're a good time to talk to other people in the room.
product placement in films would be interesting. hopefully we're not going to have Truman-show like 'advertising'