''What would be good about 2 big sci-fi films opening on the same day?''---Pingfah
If they were as good as BLADE RUNNER and THE THING, what wouldn't be? That's not to say they'd be guaranteed blockbusters, but real sci-fi buffs could spare four hours for higher quality on one weekend.
With the exception of Christmas, big-budget US films are almost always one action/drama, one comedy and perhaps one animated nearly every single week. The more films you see per year, it's more apparent. Collectively, it can get boring, or at least predictable.
Before the mid-90s major studios had more output and greater variety. You occasionally got 3 or even four dramas or thrillers in a week, even during summertime. It wasn't unheard of to get two classics in one week. Nowadays, it's almost predetermined which movie gets to be number one. Animated and action movies have the general edge. And I miss the suspense of the past.....