Aside for the obvious problem, right now, of the physically dangerous repercussions of making a Korban Pesach in its place, what would be the issue, theoretically?
There is the famous issue that is brought up, about the necessity to have the Mizbe’ach in the exact spot, something which we need a Navi for. However, during the Galus Bavel they brought the Korban Tamid, without the Mizbe’ach.
We don’t know which animal is the biblical ???. There are many breeds from the sheep family, including Dall Sheep which run wild in Alaska and are hunted for food.
Isn’t there a rule that if almost everyone is tamei meis then you’re allowed? I thought the issue was that we’re not allowed to go where the kodesh kadashim was, and we don’t know exactly where that is.