To alleviate the problem all together, WB should have released TDK with optional viewing preferences like the 2-disc Blu-ray of How the West Was Won (SmileBox presentation). One disc would have been the theatrical presentation of a consistent 2.35:1 aspect ratio. The other disc would have the IMAX version with both the 1.78:1 cropped image and the 1.44:1 original aspect ratio via seamless branching.
Yeah. it'd have to be another disc...and probably a higher price altogether....but for something where you get a 'smaller' square frame center-punched into your 16x9 screen (it all has to be put into a 1920 x 1080 frame). Yeah, you'd be getting the 'full frame', but not necessarily the actual picture quality of it.
It really comes down to the directors intent regarding the original aspect ratio. If Nolan wanted to utilize the immensity of the IMAX frame, he shouldn't need to crop the image at all (Mise en scéne). Seems strange. To give WB and Nolan some credit though, most IMAX Blu-ray's have been altered (Grand Canyon Adventure, Under the Sea, Space Station). I guess it's more of a larger problem with presenting IMAX features at home. Most people can't come close to the original IMAX presentation at home. It's more or less a compromise. A compromise I'd rather not make.
Again, it's not just about the actual aspect ratio, but the increased resolution/depth of shooting on a larger piece of celluloid. Even if an IMAX frame were 1.78:1, you're still shooting to a piece of film that has more surface area than 35mm, so cropping really isn't a compromise unless you compare it to a very specific and comparatively rare presentation circumstance...in this case, a full true IMAX projection in an IMAX theater. Of course, he could ultimately intend the film to be seen in IMAX for greatest effect...but he's already 'compromising' that by having to shoot some stuff in 35mm. And when it comes down to it, we're all compromising when we watch on even the best HDTV systems anyway, because they're only 1920x1080, whereas mastering formats are 2K and 4K for 35mm, never mind IMAX.
So unless you're actually watching a true IMAX projection, you're already getting a downres'd version of the original. Even if you had a 4k projector or monitor (which cost more than many cars out there), you're still getting 35mm quality at best, in terms of 'pixel-for-pixel' presentation as far as can be determined.
So don't let the technical tidbits that you pick up from discussions/articles/etc. about IMAX get to you too much. Our standard, as far as the consumer/home end, is HD...so 'original' frame size is rather moot compared to picture detail and resolution when it's all being converted to just under 35mm quality, and still compressed at that. The filmmakers understand that as well, and by shooting in IMAX, they're providing a high-end venue for viewing the film, but they're not compromising anything when it comes to 'normal' 35/digital theaters.
They're not composing with any essential information in the extreme top or bottom of the original IMAX frame that will somehow detract from the story if it's cropped out. It's more about taking advantage of the 'atmospheric' viewing experience when watching in an IMAX theater....something you won't get from any 35/digital theater or home theater experience anyway, so you're not 'losing out' on anything that you can't really use to begin with. It's kinda' like having a race-track suspension/differential setting on a car, but never taking it to a race track. An IMAX theater could be analgous to actually going to a race-track to drive their performance car there, but at home and around town it's a different story. You can still enjoy much of the car's performance, but it's still not the same as a track.