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Toyotas last a lot longer than GMs.

Irrelevant.

Does the Toyota Prius last longer than the Hummer H2?

I don't think so.

Overall reliability of the make is an pretty good indicator of how long the car will last. Remember, the batteries aren't the entire car. If the article had demonstrated that hybrid batteries drop dead, beyond repair, the moment the warranty expires (which of course it didn't even attempt to do, since there are no data out there to contradict Toyota's expectation that it will last 15 years) it's a similar cost to replacing an engine. Not at all the same as scrapping the car completely.

Your question, however, really is irrelevant. The ridiculous original per-mile cost numbers aren't based on the Hummer simply lasting "longer than" the Prius; they're based on it lasting 3x as long. If the Hummer lasts twice as long -- a claim for which no one on earth has any precedent -- the numbers still wouldn't add up. Maybe the Hummer can gain some efficiency by carrying more people per mile. I sure don't see that actually happening on the roads.

Full disclosure: I've never been in a Prius or a Hummer. My guess is they're both overrated, but it's just a guess.