As the owner of a 50 inch 1080p tv with a pretty good sound system you're only half right. There is still nothing in the home theater market that compares not only to IMAX but most of the higher end digital cinemas with 7.1 audio sound.
When you're talking about films like Man of Steel, the Avengers, the Dark Knight rises etc. you still can't compare the experiences of seeing them in a higher end cinema to seeing them in a home theatre, unless your home theater is a literally a theater. You're still talking about a 50"+ screen compared to a 50' screen.
As for the audience, I would actually put that in the bonus category for the home theaters. I've been to too many showings with annoying talking crowds. That i don't have to worry about at home.
As to his point i have no idea why you'd want to deprive yourself the better viewing option at all?