I just have a couple of suggestions in mind;
+About the G.E
Either leave the price caps in the GE but remove for free trade or change the GE to be able to see people's selling offers on a list, say there are 5 different people selling snapdragon herbs, for 10k, 11k, 12k, 13k and 14k respectively, you get on a list on a specific order (Cheaper-Most expensive / Most expensive-Cheaper) a limit of 100 offers of said item, so you can buy it from players directly and choose who to buy from.
A GE without price caps would be kind of useless because you would have to insert random prices and see if you get the item, if we don't have a price cap, how are we supposed to know the approximate price of the item? Either by having the caps or seeing a list of what people sell it for.
Anyways I guess you could make the GE the way it was on its first steps, giving a suggestive price but this price wouldn't be a cap, just a margin for the suggested item price, this combined with the list idea I named would be really useful in my own opinion.
+About the PvP worlds
I don't think you should remove the PvP worlds, just add the wilderness PK option on all worlds and leave PvP worlds, maybe combine Bounty/Pvp/Bounty+1 into one single kind of PvP worlds, but hey, it's not a bad idea to be able to PK in the whole map of RuneScape, I liked this idea of the PvP worlds from the moment you mentioned it and I think you guys should leave it, maybe leave one or two PvP worlds so people can still enjoy this, but man, don't remove them completely
if you say no you suck. pvp worlds suck ass, as no one ever risks anything good. and if clues r too hard suck it up. thats part of the fun of doing clues, is going to a dangerous wildy duhhhhh.