How do you plan to keep the Xorg code in NetBSD updated? Or how are you 
going to get the Xorg's code (for later updates)?

I don't recall any single or even few tarballs for (recent) Xorg X11. And 
even the latest release download site was incomplete. CVS is not used. And 
the code is in different GIT repos. Xorg is made up of maybe more than 100 
different components (which are provided as tarballs too).

Not a major issue as it can be solved technically.

But I guess it comes down to: is it worth doing this in NetBSD xsrc and 
also in pkgsrc?

By moving away from xsrc we will stop the X11 work that never got 
integrated upstream. Hopefully though this will encourage upstream patches 
and development instead of no development.

(As for wsfb, the Xorg wsfb developer indicated that he is looking at 
NetBSD's improvements for this.)