"I know it is possible and usual outside the US"
So go get a job outside the US at 250 hours and let us know how it works out.
"What are your inputs about this?"
It's a bad idea, 250 hour pilots don't belong in an airline cockpit. They do it some places and you can buy you way into it in the US, if you like. You're still putting a guy in the seat that shouldn't be there, in my opinion.
As far the the early 60's argument. First of all, most guys went to the F/E seat, which was a good place to learn the ropes. Second, they didn't have simulators so they trained in real live empty airplanes. If you were good enough, you proved it in real life. Third, training was much more intense and difficult. It mirrored military training. The military can get away with 250 guys flying off carriers because their training and selection process is vastly superior to a present day flight academy. They spare no expense to produce a quality product. You think Riddle does that?