If it had to be one way or the other, I’m actually kind of relieved they’re not including the shifting aspect ratio on the 2D blu-ray. The 2D theatrical release with the locked aspect ratio is the one I’ve seen three times and will see at least once more when I go with my parents this weekend, so even if I do make it to an IMAX screening eventually, I expect the 2D to remain the “true” version in my own memory. Still, in a perfect world it would be included as an option on the 2D disc.