Bisping training with Rampage to prep for Wandy is going to do him about as much good as Kenny Florian's training with GSP leading up to his fight with BJ. Sure Rampage has a ton of experience fighting Wandy, problem is Bisping's skillset is completely different from Rampage's, and he doesn't and won't be able to learn the tools that Rampage used to beat Wandy. Rampage has a damn solid chin and one hit KO punching power, and that's what he used to beat Silva. Bisping's lack of punching power is pretty well known and his chin probably isn't that great these days since even Kang got a knockdown on him.
Which isn't to say he doesn't have a chance, he does, and a surprisingly good one I think if he plays it smart. He'll basically need to jab & run Wandy to score points and throw in some takedowns and lay & pray. Wandy isn't going to submit him off his back and he doesn't have the best takedown defence either so it should be possible for Bisping to get him down at least once.
Of course all it takes is Wandy connecting once and it's all done. Even if it's not a Hendo style KO, Silva knows how to finish guys when he gets them in trouble, he's not going to be wasting time playing Twister like Kang, he'll be ****-choking Bisping and punching his head in like he did with Jardine.