I got hired at eagle with 1400 TT, I still thinking less than 1500 is too low.
I flew bank papers and flight instructed too for almost 3 years before getting my total flight time. Even with almost 1500 when I got hired, I really think 1500 person don't have the experience to be flying a jet or a turboprop with people in the back. I had more experience flying outside the flight instructing environment that the 85% people in my class.
We can't think about in TT, we have to think about the reality of our jobs and how lack of experience can get you in trouble.
Is not that the 121 is hard, or can't be done, but if is calle ATP is for a reason.
Everybody thinks "how would I get there?", "ahh we can get the job done with only 500TT". Of course because at the time you get 1500, 3000, 5000 hrs TT you'll see back and will say "I really was inexperience when I started 2, 3, 4, or 5 years back".