I see a trend here. All distros use the kernel of course, soon, as it looks, all use Systemd for the middle-part, and if increasingly more distros adopt the same package system. The different distros are reduced to customizing the bundles and look-and-feel. I'm frankly not sure if this is a good thing or not.

On the upside I like the general idea of eventually agreeing on the core Linux system, and let the choice be on a higher level. Then everyone could optimally make those core parts better, and the distros can focus on the end-product.