If the idea ever took off, I'm sure that the theatre chains that pay for distribution of movies would indeed cry foul, even in the case of re-runs, B movies, or old movies. Additonally, I think the business case for this is very weak -- the great majority of the public think that DTS in a theatre is better than any home systems, and market perception (right or wrong) is reality.
In Toronto, several theatres have 'VIP' theatres which approximate a good home theatre (small room, better speakers, comfy lounge seats and in-your-seat delivery of confections). I like the idea, and when attending those few theatres that have this option, I have payed the extra $5 for the 'VIP' treatment. -- Lorne