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Linux graphics support has been a heavily mutating thing for most of the life of the kernel. Initially, the kernel only talked to the graphics card for text mode purposes. Back then, X used its drivers to do everything, so it worked as a huge kernel-outside-the-kernel. Later, with Direct Rendering Infrastructure (DRI), some of the code for accelerated ...

Wayland is an experimental new display server. It is not an X server, and to run X applications you will need to run an X server with it (see the bottom diagram on Wayland Architecture). Since there are very few Wayland applications so far, this means you really can't use it to replace X yet.

I believe that this phoronix article has some answers for you about wayland and screensaver. This article mainly says that it will be more integrated : it can ensure that no window can appear atop the screensaver surface, it can properly detect idling and grabs already, and has complete control over the screen. Unlike the X design, there wouldn't ...

I think you've jumped the gun a bit — while many people may agree Wayland has a better design for the modern era (though some still disagree even on that), the implementation is not yet finished, and it doesn't yet do everything needed to overtake X, nor are the applications and toolkits ready for it. This fall Wayland is expected to declare its API stable ...

Note: My information may be out of date. I know there already are a lot of Wayland libs in Ubuntu. Wayland is still relatively new and it's a long way from well tested and complete. Several distributions are migrating towards Wayland and we will most likely see Wayland based distributions next year. X has been used for decades and there are a lot of old ...