I'd like to see herbstluftwm ported to Wayland, so I can do an apples-to-apples comparison, and be ready to switch should I ever need to. It'd also be nice if, when I did try Wayland, there wasn't something completely borked about it that causes me to switch back within a day.

While I'm wishing for impossible things, for Linus to admit he was wrong, and that there next major release will be a proper microkernel, where module crashes don't force reboots and zombie processes can be cleaned out.