Jagex is moving slowly to implement your interesting idea of eliminating competition. The hunter DnD moths were spawned for each player and then you could get RuneScape Gold private hunting areas. The bonfires threw out competition, and actually encouraged players to train with other players. Runespan is an online game that requires players for cooperation to find the runesphere. It might have been necessary to update the game in recent times.
If I were responsible for overall strategy for skill, I would focus on policies that encourage skill-based updates to the skills. The skills that demand ability, rather than time, is my preferred policy. For example, Agility would see a osrs how to buy gold major overhaul. Courses would offer more than just the standard route. Also, there would be the possibility to run faster if you're proficient in the area.