Sway/wlroots.
> Consistent window decorations?
This is up to individual compositors and toolkits.
> Thousands of applications
Like what? Any that rely on X specific behaviour run via XWayland.
> Consistent performance
Wayland in theory should be faster than X, but again, this depends on compositor.
> Redshift
Gnome has night-light on Wayland already. KDE I think just added it.
> Global keybindings
There are proposals to allow better negotiation of key bindings. But I think it's a bonus that applications can't listen into keys when they're not in focus.