I only have one thing to respond to this with.
But seriously, they made tutorial island for a reason - to give the players a good grasp of the fundamentals of the game. I feel that if anyone is to blame for the rapid confusion, it's the players who show off these 'impressive specticles' and do not attend to a player's 'what is that'. When someone is alone in the world of Runescape, they want to become part of Runescape society, so they ask for help.
If you want to eliminate beggers and such, answer their questions and help them out to an extent. But basically, try to get them to do things on their own.
And to respond to this 'leave lumbridge at level 15' ... I don't think so. More and more people join Runescape, and there aren't very many monsters in the Lumbridge area alone to train with. It would become too over-populated, and there would be many complaints.