First of all, stating that I am not listening does not make your post more correct.
Secondly, you are making some pretty big assumptions in this post. You are assuming that decisions on this have already been made by most consumers. With a little convincing, I am willing to bet that a lot of consumers will turn. And since it makes good business sense for an EB/Gamestop to sell something they have rather than something they don't, I am willing to bet there are a lot of retailers out there who will attempt to do just that as soon as PS3 runs out.
You are also assuming that you stating there is no debate means that all consumers are 100% committed to PS3. With the price differentials in the industry, as well as the content and availability differentials, I say that throws your assumption into question.
Other assumptions include that little Jimmy will get what he asks for. When a parent realizes they have to pay $500 or $600 just for the system and then they have to get games additionally, that can certainly change someone's mind. The current economic situation across most of the population is not exactly favorable. If there is a cheap substitute, people WILL take it if they are in such economic straits. And since they will end up getting good games with it, little Jimmy isn't going to scream very much once he starts playing his 360. From a consumer's perspective, if they are convinced the system is basically the same thing but its available, they will find their way to convince little Jimmy.