I voted 'yes'. My reasoning...
I see it like this. Increase the number of e-reader devices and you will increase the total number of pirated ebook downloads.
However, this is in absolute numbers only! In my opinion the kindle will drastically decrease the proportion of pirated ebooks downloaded vs legal downloads. As a whole the publishing industry and authors will benefit greatly from devices such as the kindle. Well, providing they allow customers based outside of the US to give them their money.