I don't agree. An LTS release is not the place to introduce such an huge change. An LTS is a stable release, and should include only stable, well-tested software.
I, for one, hope they'll introduce Mir in the "right" way (to be honest, I hope they'll just drop it and switch to Wayland, but that's another story), which mean a release with only X and alongside a Developer Preview with Mir, then a release with both X and Mir installed, but with X the default and an easy way to switch for the user, and then a release with Mir by default (but X still available). After that, we can talk about an LTS with Mir.
And, even assuming Mir is ready for the desktop (it isn't), the support everywhere is missing. No toolkit has official Mir support, there are only some downstream patch by Canonical for Qt (and maybe Gtk3? I'm not sure). There is pretty much no driver support for Mir (I think only the Intel driver has what they consider stable support, and even there is all downstream).
What's the point of shipping with Mir if it mean using XMir for every single application (and XMir is not ready for the desktop as well), a subpar experience for users since it's not well tested, and it would have to failback to X for most configurations anyway.
I, for one, hope they'll introduce Mir in the "right" way (to be honest, I hope they'll just drop it and switch to Wayland, but that's another story), which mean a release with only X and alongside a Developer Preview with Mir, then a release with both X and Mir installed, but with X the default and an easy way to switch for the user, and then a release with Mir by default (but X still available). After that, we can talk about an LTS with Mir.
And, even assuming Mir is ready for the desktop (it isn't), the support everywhere is missing. No toolkit has official Mir support, there are only some downstream patch by Canonical for Qt (and maybe Gtk3? I'm not sure). There is pretty much no driver support for Mir (I think only the Intel driver has what they consider stable support, and even there is all downstream).
What's the point of shipping with Mir if it mean using XMir for every single application (and XMir is not ready for the desktop as well), a subpar experience for users since it's not well tested, and it would have to failback to X for most configurations anyway.