Not necessarily. Not everyone believes that OoT is the first one, and even if it is, that doesn't mean there wouldn't be any Link before that. Nintendo could just make a new story revolving around a Link that wasn't remembered by the time OoT came around or something.
I'm not sure I would say TP warrants a prequel any more than the others. For example, OoT didn't explain hardly anything about the Imprisoning War, Rauru (sp?) and the other old sages that weren't seen, or the temples. Or like in MC; they didn't say much about the backstory of the Picori...