And who would tell the distro creators this? Linus? I don't think so. If he did that, it would cease to be linux. Linux is, by definition of it's creator, open. You are free to do with it what you please. If that means fragmenting the community, so be it. Let them follow you, or not, as they see fit. Does it cause problems? Sure. But the alternative is telling people what they can or cannot do with the source code. And that would not be Linux.
Linux may or may not converge into less distributions. You are free to argue that it should, and others are free to follow as they see fit. But somehow restricting people from creating forks of the code would be going against everything that Linux was created for. There are plenty of walled garden OS's that can offer you a consistent experience. If you want that, choose one of those. Linux will continue to be relevant and useful to many long after you're gone, regardless of whether you find it's particular use model suitable to your tastes.