Talk is cheap. We can talk ad nauseum about changing things but until you create a need to change there is absolutely no motivation for the company to do anything.
Bottom line: Quit playing games for credits with people you don't know and trust. Quit playing tournaments sponsored by WGT that award prizes and credits. If (and I believe that's a big "if" anymore) the income from those tournaments and games drops enough WGT will address the issue. No change means that WGT is satisfied with tourney and credit game income levels where they're at.
The reason I say "if" income levels drop is simple. There may be enough sandbaggers and multi-accounters playing those games now they are providing enough profit to carry those games. My philosophy has been to stay away from those games and let the cheaters beat each other up.