The reason they are trying to stop it isn't just this film though. Lets just say that by not showing this film both Disney and Odeon lose £5million. Now lets say the impact of the reduced lead time to DVD is a loss of £100,000 for odeon. If their fear is right that by Disney is trying to reduced the standard lead time, then that will be £100,000 loss per film, for every film for the rest of time. Ok numbers pulled out of my arse, but I hope you get the idea. Attempting to oppose this change is more profitable for Odeon as long as the reduction in projected profits is non-zero by the change.
Odeon's logic in this matter is (at least to me) is perfectly reasonable. I still don't understand disneys.