How do you know there isn't? (Insofar as there is ever a 'public outcry' for anything rugby league!)
What I do know is that there aren't any committed junior players in Manchester playing in regular competitive rugby league for local clubs. Someone with access to an RFL database might be able to correct me or identify scores of young Mancunians travelling into Oldham, Salford etc in order to play but I kinda doubt it.
At open age level there's one active club in Manchester playing in the entry level merit league and a couple more proposed clubs that haven't yet played any actual games.
I'm not pointing this out to belittle the work that is being done at grassroots level - it's bloody hard and frustrating and takes time and perseverance - I'm just pointing out that there are probably other more important things that people in rugby league development could be doing other than establishing a CC1 club.