Its not that they CANT index them, its that (from dozens of pages I have read on the subject) static pages are proven to provide better rankings.
I think this static/dynamic thing carries way to less weight (if it does) to even bother about. If possible, just remove the extensions altogether.
Balderdash - NONSENSE. That's my word for today. Anyhoo, yeah that's total "balderdash." If that is true, then why o why are there so many wordpress sites that are ranking higher than static ones?
I've been involved with few hundred websites and all of them are fully dynamic. And their online presence? Beat their competitors within first few months of being live.