It's axiomatic that if you try to please everyone, you end up pleasing no one.
I think D&DN is heading down this road.
It's not a case of trying to please everyone so much as have broad and varied appeal. 4e really focused on appealing to a single audience, perceived as the largest minority. It made assumptions on playstyle and what people wanted from the game. For people who liked that playstyle, 4e was amazing. For everyone else, it just didn't do what they wanted. WotC had expected everyone would just follow along because the game was D&D. And, of course, they didn't.
I think you can roughly divide the D&D community into two main camps; the 3E/PF crowd and the 4E crowd. I realize there are OD&D, 1E, and 2E players out there, but I find that in most arguments, they're gonna come down on the side of the 3rd Edition folks. They'll remain united so long as the 4E people are a threat.
I would disagree strongly with this. There are a large, large number of old 1e and 2e fans, who want very different things and were disappointed by 3e. And there are likely quite a few players who are not perfectly satisfied with either edition.
Life is very seldom convenient enough to divide things into two equal sides.
What the 3E/PF player is supposed to see is a return to 3E inspired combat mechanics, the exit of grid-combat-is-required, a renewed emphasis on non-combat abilities and skills, class flexibility, and setting flexibility.
3e was a flexible and very hackable system. I would be very wary about lumping all 3e players together.
Many might also want balance (just not the symmetry as balance of 4e), fighters with something to do, wizards with at-will spells, and other traditionally 4e concerns.
What the 4E player is supposed to see is a continued commitment to game balance, especially where combat is concerned, clear and well defined roles within a party, action oriented design with little downtime, etc. etc. etc....
From what I've seen, 4e players mostly want to feel like their edition was not considered a mistake and not to be thrown under the bus in an attempt to appeal to a different demographic.
I made the comment in one thread that I believed that Wizards has an opportunity with D&DN to either A.) win back the 3e crowd or B.) retain and grow the 4e crowd, but it would be difficult to do both, and on their current path, they'll accomplish neither. It was sort of off-hand at the time and I didn't really think about it before I posted it, but it got several replies in agreement and spawned a bit of a side conversation on its own.
First, WotC has already tried to grow the 4e crowd via Essentials.
They didn't embark on three years of design and low-profit recouping despite high design expenses for fun. Making a new edition is very, very expensive.
They clearly want to grow their numbers and have realized what you say above: the audience is very splintered and divided into angry factions. They cannot move forward without at least attempting to unite as much of the fanbase as willing. It's toxic and not conducive to growing the game. Who what to get into the game with this hate everywhere?
The attempt won't reach the hardcore edition warriors, so they get left behind. But everyone willing to compromise and let the edition wars go can be welcomed by the new edition. And that's an audience WotC wants.
The more I think about it, the more I think the very mentality that the design team is taking is going to doom the product. As a 3E guy myself, I actually feel like the best thing Wizards can do at this point is re-up on the ideas that produced 4th Edition and grow that market rather than attempting to bring two disparate groups together and missing the mark with both. Accept that the Fantasy RPG market has been divided into two markets, and target the one you already have, make them your own, and let Paizo pick up the remainder.
If 4e had sustainable numbers and its books were generating enough profit, wouldn't WotC continued to publish that game rather than have their in-house staff not produce any content for three years and generating a fantastic amount of debt?