What I mean is make a completely new sequel only connected to the previous one by world. Those are just updates which means it is still the same game just modified like Minecraft.
A Runescape sequel has lots of potential just add in more complicated mechanics, fantasized graphics and a console port and you have a recipe to create a franchise.
O and a overall plot.
Random but do you remember funorb and the runescape armies of gelendor(or something) game? The different factions were interesting. Too bad funorb was abandoned years ago. Had many good games on it.