You're right entirely. Everytime Jagex brings out some way that they are going to "Kill" botters or goldfarmers or anything, I just sit back and laugh. The RuneScape cheating/blackmarket will only die when no-one plays the game anymore, because there always is a way, or members will always find a way to dodge Jagex's attempts.
When it comes to people saying "Players will now just buy Bonds from Jagex and then sell them for GP because it's safer than using Sythe", well first of all bonds aren't that needed, they'll almost only be used for membership, gold trading is a lot bigger than the need for membership, and other reasons.