I agree with you. A Justice League movie will probably be released at some point, but only after The Avengers has ran it's course, so to speak. The thing with an ensemble cast is that you can still only have enough characters in the movie for each of them to be able to contribute something to the plot and dialog. It seems to me that a movie can't have hundreds of superheroes in it and have it make any sense at all. It would be a turd, most likely. .
It's indeed the big picture.
WB will likey re-evaluate it's committment to frequent DC films. Given their failure with these films in light of Marvel's/Sony's success with such films.
To whit, TA will likely hit a billion WW today (Sunday). I think that makes it the fastest film to do so ever.
I's the first Marvel film to do this and the 5th Disney film to do the same.
Sales of Cap and Thor DVD's were hot to begin with but both jumped 50% this week. It's synergy and it speaks to a clear advantage to a shared universe.
Cap and Thor will ultimately outsell SR and GL on DVD. No surprise. They are better films.
The key is that both Cap and Thor made a slight profit in their theatre runs. The DVD sales are pur profit for Marvel and those sales are huge.
SR lost close to 100 illion in it's theatre run and GL lost more than SR. After DVD sales SR turned a slight profit. GL not so.
Cap and Thor have turned into far, far more profitable investments for Marvel than Superman andGL were for WB.
That is what WB will be discussing over the next months IMO and not how quickly they can copy TA and get a JL film out.