Nope.....is the Empire State Building outdated? It's a beautiful, one-of-a-kind, pure Disney park and "practically perfect in every way" just like it is.
The topic of the thread isn't about taking away the nostalgia of MK's Main St. I'd agree with you if anyone was talking about removing the pagoda or the stave church. Future World deserves to be about the future. Think about it from a child's point of view. If that part of Epcot depicts the past, what message does it send?
The Empire State Building is surrounded by the most modern buildings in the world (across all Manhattan), and the balance of future and past is what makes the island so iconic.
Early Epcot promised, per a quote from Walt, " If we can bring together the technical know how of American Industry and the creative imagination of the Disney organization - I'm confident we can create right here in Disney World a showcase to the world of the American free enterprise system."
Epcot was also designed to celebrate the classic balance of past and future. It could be SO much more: the promise of 3D printing, the latest in robotics, innovations in solar, etc.
Imagine an Epcot where children could print a toy from their own imagination. Imagine trying the newest electronic prosthetic. Imagine the fun of holding a completely flexible cell phone? Epcot could offer all of the above and more.
The world is full of amazing innovations. When Tomorrowland was young, it celebrated the whole idea of exploring, "If you had wings, you could do many things. You could widen your world, if you had wings." Young Epcot celebrated the promise of the future, and it should again.