So many iterations of Tomorrowland have existed over these fifty years, but I really have not fully been satisfied with any of them. While the architecture and other fixtures of the realm do appeal to me, for the most part, the paint and finishes were, and still are, problematic. The biggest problem with Tomorrowland '98 was the overuse of oranges, browns, and other highly-saturated warm colors. But, the sterility of white isn't very interesting, either.
I like the iridescent quality of some of the new blue paint used in the realm, but so much of the area seems to lack the same kind of variety found in Adventureland, Frontierland, and Fantasyland.
Using different color schemes could help to provide this variety.
Using murals, along with more complex painting techniques, would also help.
Tomorrowland '98 did, at least, add more visual detail through these techniques. The panels that flank the murals at Star Tours, for example, used two colors that faded into each other, and on top of this surface was applied gold symbols and other visual detail, which has since been lost. The giant drafting triangle at Innoventions, too, looks so odd and sterile without the faux patina and mottled look that the architectural feature sported before.
The white, cream, and iridescent blue scheme added for the 50th anniversary was a workable stop-gap measure, but, a new look is still needed to make Tomorrowland appear visionary, futuristic, and otherworldly.