Well, the difference is stabbing Motorola and IBM in the back killed off PPC on the desk/laptop (well, that and some technical reasons). I'm not too sure that stabbing Intel in the back is going to result in the same outcome...
I'm not sure that qualifies as stabbing them in the back. The PowerPC wasn't producing promised performance and Apple smartly had a contingency plan just in case this happened. What's wrong with them doing what they felt they needed to do to protect their business.
