@nickyboy
I understand what you are saying there.
These days in fact, the pathways from amateur RL to Pro RL are severely reduced, coming from an over reliance on Southern Hemisphere players & a lack of leadership & investment from the RFL.
Locally & very close by I have two RU clubs in Leigh RU & Tyldesley RU & they have been around a long time, yet my first introduction to RU was through the RAF, not school & prior to that Internationals on TV.
The situation in RL land is so bad that Leigh Centurions have withdrawn their Academy team as there was a) too few teams in the Academy Comp/League & b) a lack of meaningful competition.
Leigh were invited by Super League member clubs to compete in their Academy League but have chosen to focus on building for SL first.
All of this means that our juniors have little scope for bridging between amateur & pro.
Looking from the outside in it appears to most RL fans that the difference in professionalism, leadership & investment between the RFU & RFL is the biggest limiting factor for the growth of RL, rather than any lack of raw talent.
I don't know how RU fans feel about pathways & structure in RU land, but you are certainly on the right track with the M62 corridor comment, it is highly unlikely that many schools or colleges in the NW give RU even a seconds thought, maybe Leeds is one example where they run along o.k.
Sale Sharks playing at Salford Red Devils *3rd iteration* doesn't seem to have attracted much commitment towards RU in the Greater Manchester area.