We have Bill Unruh! He can teach your astrophysics.
Anyway, I don't actually see a need for biology for arts students or whatever, those courses are a tad ridiculous. If you can't take mainstream science courses, then don't. Dumbed down ones are a pointless waste of time meant to fulfill requirements. And besides, there are sci courses arts students can take. I took a 3rd year acoustic physics class... not easy, per se, but I got a 79 with a bit of effort. Again, pointless in retrospect, because I have little to no use for that knowledge, though someone might, so the class should be there... but that ain't intro.
I think specialization was a key point. You're into diversity in uni, and that's cool and all at a first year level. But once you get up into the upper years, it's just not possible to excel in any given area (or it shouldn't be) without a hell of a lot of basis in that area. In other words, in order to maintain 3 areas of expertise throughout your undergrad, you'd have to take summer courses and a full load every term. If you can say "Well, I managed it", then something's wrong with the way those classes are being set up... higher level education REQUIRES specialized knowledge. A double major within one faculty should be about your limit on a regular course schedule, realistically.