It is a good idea to be able to RuneScape gold drop anything at any moment as with other areas of RS and limiting pouches in this way feels unnatural in pvp worlds, and even more so in what the wilderness should be. This is a problem that I don't know how to fix. The best option is to just declare "Pouch in Invent, Combat Goes Up".
My last and most important point is, don't have pvp wild worlds. Ever. The excitement of the wilderness provided one thing that pvp, bhworlds and other modes do not have. This was the most effective method of handling it that I have ever seen.
Pvp meeting pve players. It was possible to use limited resources such as rune, treasure trails and dragons to earn rewards. But, it was not a obligation. My previous comment regarding quests is that each player should have the ability to access the content. However, making certain worlds "safer" isn't any sense. This is the thing I'm most worried about, if there is an uninvolved world that doesn't be attacked, it negates the point of it all, an element of risk.
No runecrafter with use the abyss of danger since there's a safe one to use one hop away. Armoured zombie-goers can simply move to a safer world once they have left the wilderness. In fact, that would work for any world. This is a plea. Don't promote the idea of safe worlds or the half-assed wilderness. That would defeat the point and ruin the fun of being in the wild.
Since wilderness and free trade are under discussion, what will happen to things that were originally made in order to replace them? A quick history lesson... GE+ was established about a month ago, just before the infamous changes to buy OSRS gold free trade.