The 1500 hour rule would spell the end for lots of wannabes.
In the US there is a GA industry that can provide employment for the large number of low houred pilots. In the UK there is not.
Imagine how hard it would be to get the job on the Kingair if we had that rule. There would be hundreds of applicants and a large portion of those would be willing to pay for the priviledge. It would make things worse.
The people getting the jobs would be foreigners from countries that have large GA industries such as Oz, USA and millitary pilots.
If this ever does come to Euroland expect to see 0-1500 hour P2F courses for £200,000+. They would probably be queing up to do it as well.