Linux

• marketshare: Who cares, and who ever cared (that much)? Developers will work on whatever they like to solve problems.
• fragmented platform: HAHAHAHA! You serious?! There's always been interest in having alternative software/solutions. Some people like having choices, especially when not all of them work for them.
• real-world impact: The impact is choice. You can't stop developers from working on what they want, and you can't stop people from using what works best for them. Choice is great.
• a gigantic step backwards: Choice is a step forward. Are you afraid of choice? Does either project address all needs? No. That's why choice matters.
• damaging the Linux ecosystem: It's people who put politics forward and make noise that cause... noise. Meanwhile, lots of people who care about what works best on their devices will choose that, be it Wayland or X11. No amount of politics fixes hardware compatibility or use cases. It's either choice or different hardware, and hardware is typically more expensive.
• casualties: Oh, the drama... Neither project takes away anything from others. People can install what they need, or switch distros if that's really necessary. Whoever needs specific functionality can use the display server supporting that. No one can stop them.
• a better way: Yes, the better way is to grow up and realize that choice is important. Asking people to not recommend whatever works for them makes no sense. They will recommend what works for them as long as others have identical or similar needs, because they know that thing works.
• what you're asking for: ... is lame. Immature even.
• to distribution maintainers: Offer the two options in discussion. I agree with this, options are important.
• governance: You know, people are free to come and go. Yes, politics unfortunately makes victims. Even you asking people to not promote Wayland is political. If you don't like politics, take your website down and don't try to interfere in people's choices. How do you like that?
• gatekeepers: Quite ironic to complain about others being gatekeepers while trying to put a project in a bad light and asking people to not promote it. If you don't like it, don't use it.
• powerless and frustrated application developers: Again... you serious?! Do you mean anyone can stop software developers write their software for whatever platform? They have the freedom to choose what to support, no one forces them to support everything.
• signatories: nameless, of course, because that level of bravery is required to tell others what to (not) do.

Grow up. You could've just asked for distros to keep offering both options, and leave it at that. X11Libre still has plenty to prove in terms of viability - it's basically a newborn. Even when you completely ignore all the politics, at this point in time there should be no surprise that some distro makers are on the fence about its future. It's like you go to work and recommend your manager to start using a 2-month-old distro in production. One last time: you serious?!