But I was informed that the idea that Disney would ever touch a ride as "iconic" as Space Mountain was absolutely absurd...
It's certainly possible that WDW's SM gets a similar makeover to bring it into line with the neighboring Tron. The problem with that, of course, is that SM and Tron are already very, very similar rides, and making them MORE similar solves nothing. I think this is instead a worrying acknowledgement that Disney considers SM and Tron interchangeable, which bodes ill for SM after Tron opens. In any case, its proof that the one element of SM folks were sure could was untouchable, the exterior structure, is very touchable indeed. I think WDW's reluctance to build much of anything is SM's best chance now.
As for the look of the ride, Tokyo DL is obviously the most consistently excellent park in the Disney chain and possibly in the world, but I'm not wild about this new look. It seems likely to become outdated just as quickly as any other contemporary vision of the future - and that second node sort of strikes me as a pimple on SM's shoulder. I've always thought the best way to go with Tomorrowland was to fully commit to a retro look, either WDW's Buck Rogers-esque aesthetic or Paris' Jules Verne-y take.