Aside from all the safety issues pointed out, can you think of anything more deadly than having to complete 240hrs in a simulator? With no real flying except before and after
240 hours of practise ILS/go around, SE work, electrical failure, gear up landing etc, etc. How many scenarios would you need to fill those 240 hours? Like most kids nowadays, they'll be able to handle the computer after a few hours, but a simulator whizz kid is probably not going to be much help, if or when they get spooked in the real world.
How do you persuade newbies to sign up? Come along and sit in a simulator for the equivalent of 10 non-stop days, and then have no chance of command upgrade for the next 10 years