The problem that MOS will have to face versus The Hobbit is that it had a double threat every weekend for 4,5 consecutive weeks.
WWZ and MU now, The Heat and White House Down next week, then DM2 and Lone Rangers, then Pacific Rim and Grown Ups2, ect...
It will have to face 2 newcomers and 2 freshly released potential blockbusters at the same time, each weekend with sequels thrown in the mix which by essence are frontloaded and take a bigger share of the weekend grosses.
That's when wom and GA reception play a large role. That's why movies like STID were able to resist more when facing big competition such as, Gatsby FF6, EPIC and Hangovers 3 whereas a movie like Hangover 3 plumetted quickly.
And in that higly competitive environment, if you are not competitively strong enough, if people just jump to the new movie as soon as it is released instead of rewatching yours, it's because wom is average at best. You only rewatch a movie facing competition if you have the feeling that this movie is better than what the competition propose as another option...
The worst case secnarios MOS and all the new releases will have to face is that highly competitive test. The most volatile movie, the least competitive one will lose quicker its theater counts to make room for the weekly double threat and lose opportunities to generate more bucks.
I beleive overall legs will be cut short for many movies in the next two weeks.