Also, Windjammer did not say that, the guy he was quoting did. He might not appreciate having it attributed to him.
Thanks for saying that, really appreciated.

That said, now that it's pointed out I think we've warded off the risk of misattribution.
My personal opinion focuses less on 'would it be a good thing?' but more on 'is it actually the case?'. I don't think it's the case. The quoted claim was based on a certain interpretation of DMG 3 and Arcane Power 2 not coming out this year, owing to WotC putting their effort into the Essentials line. I think D&D Essentials was planned for ever since early 2009 (if not earlier) to drive more sales to the "Core" supplements, and that recent supplements like Hammerfast and the Dragonborn Race Codex are good indication of WotC' plans to create materials that can be easily used with the Core game and the Essentials game - not to mention edition neutral material like Dungeon Tiles (where we're about to receive the best sets ever since their introduction). The frequent claims of the Essentials line supplanting, and competing with, the Core line of the D&D game seem to me fundamentally mistaken. On my reading of the product development, WotC wants to consolidate the customer base around the Core line and DDI, not fragment it.
Finally, we are in a recession in the boardgame market (see the recent discussions on FFG pulling the plug on BattleLore since the economy can no longer sustain production costs it could a couple of years ago), which means the market needs to adjust to this situation rather than just fold up.
(Even prior to Hasbro buying WotC (and by extenuation, D&D), I've always thought the lifeblood of RPGs to be tied to those of boardgames.
)
In other words, if Hasbro has put pressure on WotC, and would then give up the D&D brand, this would have less to do with 4E in particular, and quite a bit with short sighted planning - or, perhaps, a pessemism on the boardgame market's ability to recover in a couple of years.
Returning to the OP's own question, the question is I guess if there can be life for D&D after Hasbro. Of course there can - D&D will always find a publisher. And going back to a smaller scale could even re-invigorate the D&D brand by focusing on its core customers, pedalling back quite a bit from the current trend to open up the market.
Would this be bad for 4E? On the direct level, certainly. It would mean the end of product support. However, just as with D&D 3.5 I don't hinge the quality of the game on an endless supply of supplements. Perhaps the Core 1's didn't deliver the complete game to everyone, but anyone who's got the Core 2's on his shelves as well ought to have everything that's needed to keep him going for years on a solid game to boot.