The more you learn the less you know is a mantra that I find to be more and more apt as I progress in flying. Bottom line is, the current civilian training and education in aviation does not on average produce candidates that are ready or experienced enough at 250hrs to be regional FOs. I went to a two pilot crewed Beech 1900C at ACE when I had 500hrs, and though it worked out great, and I learned a lot, I was not an effective crewmember for the first two months or so. It wasn't that I was behind the airplane, or couldn't fly it (its an easy airplane to fly, though my landings kinda sucked in that airplane for a couple hundred hours), it was that I lacked the requisite experience and judgment to successfully be a co-captain, which, imo, is really what all copilots should be.
I don't particularly think that you have the judgment to hold 75 peoples' lives in your hands at 1000TT, or even 2000TT for that matter, the only reason it works is because most of the time (99.99999999% of the time) everything works, the conditions don't get too dangerous, and the flight is completed as planned. When something is outside of the ordinary, when the proverbial poo hits the fan, then you see the value of good training and experience. Do you think Al Haynes' first job was a RJ gear monkey? No. Do you think the crew of the Gimli Glider got their first jobs out of ATPs? No. They worked up from the bottom, learned the true meaning of aerodynamics, and learned what it takes to make it when things go wrong.