First of all, in spite of some scientific & other issues, I really liked the movie, and I especially thought the several bits of 'homage' were well-handled.
If you are going to nitpick the science, you really don't need to get into the quantum physics at all. They clearly have the technology (and had it developed quite a few years before the time in which the film is set) to make use of re-usable single-stage-to-orbit (SSTO) space craft. I don't understand why the initial launch required a large booster rocket, either ... because mater the Ranger craft is able to achieve orbit from a planet with 90% Earth-gravity without any such assist.
So - if you have a fast, obviously re-usable SSTO craft that can hurl a bunch of mass into orbit over & over, you really don't need the dang wormhole. As anyone who really understands these things can tell you, if you have affordable, reliable, RE-USABLE SSTO craft, you can do all kinds of neat-o things which involve getting lots of mass off this rock (including starting a colony in space, on the moon, or even Mars).
With decades in which to work, and a presumably well-motivated civilization, they would never have reached this point of desperation in the first place. If you can throw enough mass (materials, fuel, equipment, people) into low-earth orbit with a fleet of re-usable SSTO craft (the Rangers) ... and do it thousands of times over perhaps decades of time, you will have no problem expanding the reach of your civilization beyond a single planet.