That's what I was indicating, if poorly. You're the one that said that this "one fundamental flaw" is what prevented them from tanking (a "flaw" that still existed in TBC). It was probably a combination of not being uncrittable and uncrushable, one of which was fixed in TBC.
And no, Druids could not use potions in TBC either; they could use macros that could help them shift back quicker, but they still had to shift out.