Whilst I agree with some of your points the main problem facing young pilots today is the traditional pipeline has disappeared. You also need to make a distinction between cadet programs where pilots are chosen before any training is undertaken and the company makes a substantial contribution, and "cadets" who pay for a TR.
Reality is in the UK, when you leave flight school you have a bare minimum of experience. But there are no magical entry level jobs sitting there. Instruction, at my local club with the exception of one all instructors are airline pilots who do it as a hobby (I agree with this as they have more experience to give). Cargo or charter? Jobs are very few and very far between.
The majority of people leaving flight schools at the moment and getting jobs aren't always the people who are the best pilots, they are just the people who can afford to pay £25,000 for a TR. That's the hard truth and the reality of what's been created. To say pilots need 1500 hours in the UK would destroy this "pipeline" completely but it wouldn't solve any problems.