jasonbostwick
Explorer
(Emphasis Mine)It would be deeply bizarre for WotC to suddenly pull books off the shelves which are the only non-digital source of those rules.
Also, pulling the DMG in particular would be odd, because most of the books isn't rules, but instead advice for running games.
Except this is an exaggeration of what is happening. I consider there to be a fairly significant difference between not planning on reprinting something and 'pulling it off the shelves.'
We have no idea how much stock is left of the original core set - it is entirely possible that as new customers shift to purchasing the Rules Compendium as a primary reference, the remaining stock of the PHB will last for years. (Not counting the possibility of a boatload of used copies hitting the second-hand market as current users upgrade to an updated rule set.)
Even if this rumour is true, I don't see it becoming difficult for someone who wants the core books to purchase them in print form.