Definitely the right choice. The 1D X's new features seem best targeted towards news and some sports photographers who need a durable package that shoots really high quality pictures really quickly. It just won't be quick enough to get a bunch more usable frames from a droplet collision, where you're basically dependent on having correct timing for one frame (my assumption there).
I think the 1D X would be useful for landscape photographers doing a bunch of multi-exposure HDR shots, except the resolution appears to limit the usable print size somewhat (medium format might be a better choice if that is the case), which is not to say that the IQ won't be a nice bump up from previous cameras, or that alignment issues won't be lessened shooting at 12FPS versus much slower cameras. Heck, even the mighty quick 7D shoots barely more than 1/2 the speed of the 1D X, and actually half when the 1D X is in 14 fps mode...not bad!
Beyond those probably uninteresting thoughts, I have to say thanks for the awesome sharing on method and images. I would love to look at the stopshot some more.