I was recently at a Fort in Rajasthan and one of the daft tourists was cribbing about how the Maharana built the fort so high. I had to laugh aloud. But I was visiting an Indian heritage site and asked the tour guide why parts were cordoned off - they were being cleaned for paan stains. If you aren't going to respect your heritage, you are an idiot.
The actual status of these kind of places is to tell people how nations perished when they did not follow the commands of Allah.
By the time these ruins will vanish there would be many other ruins available to future nations.
Quite possibly the empty cities with skyscrapers would be the Harappa and Mohenjo Doro of the future.