The bad blood doesn't make sense, it was an age of the Empires and it was all business and Ottomans didn't do anything particularly different than everyone else did so I don't think that it is fair to say that Ottomans were evil. If anything, under Ottoman rule despite the atrocities minorities kept their language and culture unlike the people subjected to Western imperialism in Africa or Americas. One can even argue that Ottomans were relatively gentle.

Let's hope that we never go back to these days. Imperialism is evil and I'm sorry that Erdogan and other autocrats are trying to revive those days. I also agree that it was very offensive for the christians to turn Hagia Sofia into a mosque again(was a museum till recently) and I would love to see it becoming a church again.

Also, let's stop renaming stuff. If you like Istanbul you can move to Istanbul, if you want to own istanbul you can purchase a property in Istanbul.