This is neither a good thing or a bad thing for Android. Nobody real cares, so it's unlikely to get much publicity positive or negative. It's no skin off Apple's back for two reasons. First, you already paid for the device; they have your money. Second, no one in their right mind would want to use Android OS over iPhone OS anyway, especially not if they've already paid for an iPhone. It'll have no impact on Google because of the aforementioned lack of real people taking any interest.
I am going to make the firm claim that this will have no noticeable impact on anything and will probably not even merit an unprompted official comment from either Apple (I'm rescinding my claim about Google, because those Googlers are notoriously chatty and I wouldn't put it past one of them to mention it on an official blog, but probably not). I invite anyone who disagrees to put money on it. I'll be $10 to charity against the first two comers.
What I'm concerned about is that some people, who under normal circumstances would have bought an Android device, might buy an iPhone thinking: "Well, this is the best of both worlds, it can run Android and the iPhone OS".
This kind of thinking could do a lot of harm to the Android community: less money for Android manufacturers who support Android's development, lesser user experience on the iPhone-Android (considering it's basically a hack) might leave a bad impression to first time users, etc.
Not only does the notification bar kick iPhone OS' notification scheme, and despite the low app volume on the market (I don't have /that/ many apps - and I didn't on the iPhone, either), I'm still lovin' my Android. It may just be the honeymoon period, though. (Got a SNES emulator running the other day - great for the commute. Disclaimer: I only have ROMs of carts that I have packed away in my closet)