http://services.runescape.com/m=rswiki/en/Devblog:Rejuvenating_the_Wilderness
Updates such as the ones in that blog, but obviously tuned to be more RS3 relevant.
Monster Spawns: Probably a big no here, cuz as I said in my article, the risk/reward equation comes nowhere near the stuff in the rest of runescape, simply due to the fact that you can lose all your stuff.
Resources: Only the new fish is worth it if Manta Rays (also healing 22) cannot already be collected from Trawler.
Demi Bosses: I don't know if these shields would be best-in-slot, but if not, then it's doomed on arrival.
Bosses: Forcing people to walk out of the wild is a start, but the rest of it is again doomed on arrival if the Dragon Pickaxe weren't already available from somewhere else.
Activities: Fountain of Rune sounds awesome, until you realize you have to walk in with your to-alch items and walk out with all your alched cash, Resource Area suffers from the same symptom as the New Fish, Prayer Recharger is a nice feature for wars, but doesn't attract anyone into the Wild, Thieving Chests depends on the XP rate, not loot.
See, the MASSIVE problem Jagex has, is that they simply REFUSE to put anything in The Wilderness that you cannot get anywhere else (the list above says it all), because they are afraid of the deluge of complaints about unfairness etc. Since they won't step away form than, The Wilderness remains dead.