Would you advocate pulling down the Big Ben clock tower because it's old and replacing it with a giant glass digital clock??
(Big Ben is actually the bell by the way, not the tower it's in
)
A large part of the tourist trade exists for people to look at historic buildings & monuments , and if people weren't interested in the past it wouldn't happen. I don't believe in preservation simply for the sake of it because it's impractical and not always possible, but a certain amount, and especially important landmarks should be. For one think we all need a certain something to identify with and these things create a feeling of stability.
Nice to look at and good psychologically. I've always hated some beautiful old building being removed for a glass fronted modern monstrosity just to house rich big business who couldn't care less.