Why feel sorry for them? That's part of the nature of creative work, and it's definitely something that Walt embraced, and it's historically precedented for the Jungle Cruise.
Way back in 1954, Harper Goff was assigned as the original designer of the Jungle Cruise. As the story goes he modeled a lot of it on the old African Queen movie (which he later stated Walt never saw!). It was designed as a completely straight laced tour of jungle wildlife. A lot of what we consider the "bones" of the original Jungle Cruise was designed by Goff:
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This version of the Jungle Cruise, masterfully created by one of Walt's original artists lasted ... about 6 years. In a typical story for Disneyland history (mostly apocryphal and probably highly embellished), Walt overheard a guest say that they were bored with the Jungle Cruise and had "already seen it all."
In 1961, Walt basically ripped out the entire ride, save for the eastern flank with Schweitzer Falls, and completely rebuilt it. This time with the humorous caricatures from Marc Davis. The extend of the renovation seems lost on some folks today, but when I say they ripped out the ride, well (from the orange county archives):
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This was a complete tonal change for the attraction, one that would mostly endure until the 1990s, when the time period was adjusted to match Indiana Jones and the new landing was built.
So honestly, if Walt wasn't afraid to backtrack and redesign an attraction, why should modern Disney be any different? Isn't the broader point, the thing to learn directly from Walt, is that attractions need to be entertaining and engaging for the guests, and if the guests want something different, you have to accommodate them. Changing the Jungle Cruise, or Splash, or Pirates, or everything else coming down the line, to make them more engaging for modern guests is the right thing to do.