[fjtorres]

Really, it doesn't matter if they are withdrawing or not.
To start with, their ereader distribution in the US has for years consisted of their Sony stores and mall kiosks and a handful of listings with online electronics vendors. You only found them if you went actively looking for them. And few did.
This has resulted in sales that amount to market noise and zero mainstream mindshare.
Except for techies and hobbyists nobody even knows they sell a reader.
Whether they are gone for good or just out of stock makes no difference; the US market has moved in directions that left Sony with nothing to offer.
Tell somebody Sony is dropping out of ereaders and the likeliest reaction will be surprise that they still were in the business.