I have the same issue; several of my friends are on legacy players on Excalibur, and that's the server my guild is based in. I have yet to be able to play with them, and I don't particularly want to level up a character somewhere that I'll may not be able to move or have to pay to move to Excalibur. The free week doesn't address that problem at all. If I'm not playing due to not being able to create a character on those servers, I'm just not playing.