I don't think Jagex brought back the wilderness and free trade because they think they can stop all the bots and xferring. The original reason for the abrupt removal of the now returning aspects of the game was due to IRL lawsuit issues, and at the time the only way they knew how to stop RWT completely is implementation of the trade limit system and removal of any ways to kill other players for money.
I think that the reason for its return is not some new hi-tech bot catching software, nor is it some master plan to inhibit RWT and botting, its most likely just a change in IRL issues. They have managed to find ways to avoid lawsuits for RWT and botting happening in their game, therefore they can take back the drastic measures they originally had to take.
Yes, I agree they still care about botting and RWT, but its a part of EVERY MMO, I don't think Jagex would consider themselves superior to all other MMO's in there bot-preventing and RWT-preventing skills and technology.
Not trying to argue, I quite enjoy debates such as this, but please do not tell me to "not comment on what I don't know" because I don't believe you are employed by Jagex either, so all of your contributions to this conversation are speculation, just as the rest of us, but thank you for the intelligent debate, It's quite fun. =)
OH, and PS: GURU!! (1000th post)