I wonder how Droid's battery drain will compare.
Also remember that most customers aren't geeks. They don't care if you can ssh and port forward from their phone.
Customers do/will care when their friends show them what they can do with Google Voice that they'll never be able to do on their iPhone.
1. Apple hasn't had any real competition up to this point. When customers start seeing Google Voice on other phones, the demand will force Apple to rethink their approval policy. Google Voice may not be on the iPhone yet, but saying it will never be on the iPhone is a stretch.
2. Some customers may respond, "Sure, Google Voice is cool...but can your phone do this?", and then have a conversation with you in an auto-tuned voice using an iPhone app (of course, no one would blame you for smacking them...but there is a segment of iPhone users who will stick with the iPhone purely for the apps...)
Of course, Android's market share may get to the point where developers will be happy working on two platforms (or shifting primarily to Android and it's range of devices...)
iphone's multitasking is hobbled. with my G1 i can run mytracks and go jogging, taking calls, photos, and using the web browser along the way. when i get home i get a map of my route with time/elevation/speed data. and that's without any privileged api.
Apple has not launched an Iphone strategy that is the opposite by chance. It is deliberate.