[Circle of Life]

The above sums up my feelings on the matter pretty well. I do think racial substitution disciplines are a good idea - as racial substitution levels for different classes. Defaulting to them is like saying "Well, you're an elf, so you automatically specialize as an enchanter. He's a gnome, so he automatically specializes as an illusionist" and so on. Choices like that are supposed to be optional, not obligatory.