I'm sure there is a huge percentage of people who will buy into the new edition of D&D, and would have regardless of how much or how little it changed. There's also a lot of new players who will buy into the new edition because it'll simply be the 'current' edition and will be the one available to them.
What I'm wondering however is what are the sizes of the two segments in the community.. The segment that will not buy the new edition because they want a more drastic change, and maybe will go to a different game..
And then in our thought experiment alternate reality where they made a 6e.. What's the size of the segment that won't convert, and opt to stick to the old edition.
What I mean by asking if WotC dropped the ball here, is just wondering, how big are these two potential segments of the community, and would they have been better off catering to one rather than the other. I'm not suggesting that the success of DC20 and other big "D&D Killers" will actually succeed in usurping D&D.. But perhaps their impressive numbers are a sign that the community is ready for a new edition, in a way that they weren't back during 4e.