No, I definitely don't think all old buildings should be demolished. These buildings are often a vital part of a city's heritage and give it character. They can be really beautiful and unique, unlike a lot of modern architecture, and they often attract tourists, which brings in revenue for the city. Plus, many old buildings can be renovated and repurposed as cafes, museums, or even boutique hotels, so demolishing them would be a real waste of resources and history.