A big advantage of removing the opportunity to fly from the doorsteps of UAS students is that one will then be able to see who is motivated enough to travel to the flying venue.
During my time I have seen many ex-UAS who drifted into the RAF without the right motivation, stayed for the minimum time and then left. During their time they gave little and cost the earth.
Having spent some time teaching air cadets to glide I could have picked much better aircrew prospects than those UAS wasters.