Yeah, except none of those museums have an exterior aspect to them. Any OSC at OP would be packed into a tight area, and certainly not attached to protected wilderness or TRCA land.I really don't care if they keep the OSC where it is, or move it, but this argument is absurd, schools pack all downtown museums on weekdays, with many bad things happening around them - it has never been an issue. Also, have you been across the street of OSC in Flemingdon Park? This isn't exactly an area free of crime/issues. There's also a ton of new condos going in on the North side of Eglinton across the street (given the new LTR). There is probably a reason to argue to keep the OSC where it is, but this isn't it.
The Science Centre isn't a CN Tower or Ripley's Aquarium, it is (and has always been) an interactive educational facility. So yes, distraction and surroundings are a big deal. Just ask a teacher how much the environment plays into kids' engagement.
As for the distance, I have friends who are grade school teachers, and its location definitely does play a big role as a destination. There's dedicated bus parking for schools, and avoiding the Gardiner means a lot less unexpected delay. At almost all museums/exhibits in the city, classes are taken into a venue with specific entry/exit times. For school groups coming from further distances, potential delays often need to be worked into the timing of the drive, and when kids arrive early, those classes have to wait until they’re called for their prescribed time. They arrive late, it comes out of their trip. So trips to the OSC are often longer for kids than those of say, the ROM.