In the interest of gathering as much anecdotal data as I can, I tried transferring my Primal main over to Crystal during the beginning of prime Saturday night hours (so, around 8pm eastern). There were two servers available at the time. I picked Brynhildr.

I get to the login screen, get told I can't actually log in to Brynhildr. I try the world visit transfer to let the game choose a server for me. I receive a world visit error. I try again; I receive "Unable to visit other Worlds at this time. Please wait before attempting another transfer."

Through more trial and error (see: placard clicking) I manage to make it in to Coeurl. It doesn't seem impossible to DC travel to Crystal, at least, but I can see this actively discouraging people from trying. I suppose if that's SE's goal with the new restrictions, they've certainly achieved it.