Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Questioning the necessity for Wayland and the wiseness of the choice has become a phenomena, especially after Mark Shuttleworth annouced Ubuntu's plans to eventually switch to Wayland. Following I will provide a concise reasoning why we want Wayland. At the end there are some more links for further reading.
In 1984 the MIT started X11.
In 1991, XFree86 started out of the X386 server based on the X11 platform.
In 2003, Xorg took over from XFree86 after a license dispute.
In 2008, Wayland was started to overhaul the entire system and keep only what's necessary for the desktop today, using only today's modern infrastructure in a leightweight architecture.
Over all this time, backwards compatibility has been a major issue. But after some decades you need to shed some of that compatibility if you want to remain an ideal solution for today's problems. That's what Linux does and that's what the 2.6 kernel was all about. That's the big advantage of open source.