Oh dear. That bodes well...
I shouldn't doomsay, but if the previous target group doesn't like it... and the current target group doesn't like it... Who are they selling it to?
Don't worry about it too much. According to what I heard, D&D 4 is still a success. (It's now in the third print run, and they already achieved their expectations for this year, with still 3 full months to go.)
Someone is buying the game. Moreover, someone is playing it.
For the EN World community, I posted a
poll on the topic of who is playing D&D 4 and who isn't. Not everyone is (or at least owns the books), but it appears as if 22 % of those that own the books are not interested in playing it further. If we assume it doesn't get worse in the "real world", that should mean that there will still be enough players. Who they are (aside from those I know personally, like my group, or those on EN World) - no idea. But they exist. Either it are gamers that ignored 3E (or D&D) in general, or it are new gamers.
But even if it's all doom and gloom - no need to worry. It wouldn't be "your" edition that is failing, and with Pathfinder and other 3rd party support for 3E games, D&D and role-playing in general doesn't look like it will die out soon.