1500 hours is sustainable.

And, Better to have the rule in place now and back off it later if required. Plus, the rule is better for the entire pilot profession in the long run.

Wasn't someone just saying we need some barriers to entry?

Unless your last name is nostradomus, I don't put much stock in your guess about pilot availibility and requirements 5-10 years from now. I plan to be living on the moon by then.