The one thing I do not like about this, is that it might cause people to pick their char because they might think it's better if they have that portal or not, also it does not make any sense for say a warrior to be able to make any sort of portal.
However much I'd want a portal on my lock, it's simply not part of a race, it is part of a class, and only that class should have it.
Like shamans have totems, locks control demons, hunter control beasts, then mages should be able to make portals, because it fits their class.