The main reason for such "attractions" in DL's earliest TL was to have something/anything there... as Disney simply ran out of money in 1955. I know we're 70 years removed (ie: those who visited as a 7 year old are now 77 years old, so most of earliest visitors are simply no longer with us at all), but I never heard of anyone being nostalgic for those specific attractions exclusive to the 1955 Tomorrowland (the earliest examples I can think of for nostalgia for ex-attractions of TL are "House of Future" and "Flying Saucers" which opened a few years later. My point is....whereas I doubt anyone mourned the closure of KAHoF or the "Bathroom of the Future," I acknowledge that if/when HoP, certainly a product of its time, ever closes, many (including me) will be upset for many valid, nostalgic reasons.