Its arguably too high, constraining the supply of pilots, and the supply of well-paying jobs, resulting in things like Colgan Air Flight 3407.

In the US, I think that's probably true especially using hours as a proxy for training.

The EU has shown us that you can safely have far fewer hours.

As a pilot I do think that nothing replaces butt in seat, but I also think that 1500 hours of instructing/aerial surveying/hour building is well into the diminished marginal returns area.