What format does the Kindle read? Amazon's (and PDF, but only poorly). In the years since the Kindle launched, Epub has risen as a competing format. Have they even hinted that they would allow it on the Kindle? No. heck, they don't even support converting from Epub.
I'm sure you know about the Kinlde apps, but where are the competing Kindle ereaders?That's simple; Amazon won't allow them, obviously. Oh, and those apps aren't a sign of openness; Amazon are making use of someone else's hardware.
After you think about how Amazon have behaved with the Kindle, doesn't it seem more likely that the Amazon tablet would be just as closed?
Do you still want one?