A lot of shots will be extinct. And that's why we have shots of them.
Mind, not condoning the destruction of habitat. But really, everything changes over time.
Frankly I have no interest of reproducing the same image that has been done thousands of time. Sure, sometimes its just about doing it yourself. But what do you really get from standing elbow to elbow with others doing the same thing, or beating them to the punch, only that, many already did that before you too. There's nothing unique going on here.
I think its much more rewarding to simply go off and find stuff that isn't ultra-popular and on a top 10 budding photographer bucket list that is overdone to the moon and back.
I know if I went to a national park and saw a line with 1,000 people in it, I'd be cussing back to my car and leaving.
And for everyone concerned with the lost potential shots and sights here on Earth, you should see the legendary tears spawning from the amount of light pollution that has ruined what you can enjoy in the sky.