I haven't seen the documentary, have only read the reviews.
I agree that the local offer at 16/18 & accommodation options, are make or break factors for so many.
There aren't enough apprenticeships, not everyone knows what jobs exist as a teenager, some kids don't get on well enough with their families to continue living at home (or to get the state expected financial contribution from parents if at uni), most jobs that don't require degrees now ask for degrees...lots of push factors.
It's a mistake IMO to reduce the value of a degree to future earning potential. Education is intrinsically valuable & creates many benefits for a society that cannot be measured with money.
The disappearance of adult education, night classes etc. is also dispiriting.
Employers need to pay more towards training.
There's an academic researcher of decisions re. FE/HE & barriers on MN but I can't remember her username. Always interesting to read her comments.