I'd go with it.
I've always liked the look of the Sony over the Kindle. Add to the fact that most people can walk into their local BestBuy and get one gives them a leg up over the Kindle.
I'd imagine they would have some sort of WiFi purchase option, even they wouldn't be that dense not to

Especially seeing as the iLiad has this feature.
Now, how soon will be the real sticking point. It would be foolish to announce so early without a model coming (very) soon unless they are really getting beaten up in the sales department by the Kindle
And if sales have really plummeted because of the Kindle, adding WiFi without some other spiffy new features (such as some type of fold out keyboard or touch screen, ability to make notes, Digital Editions, ePub) may not be enough.
They'd also have to keep the price low, or at least no higher than the current model.
(I'm still of the opinion it isn't DRM that is keeping folks away from e-book readers, it's the high prices

)