Well, I'll admit that hybrid regimes are hard to model from that POV. But practically, they seem to come with nearly all the disadvantages of plain autocracy (even for the rulers themselves) so we should still be seeing a "rational" shift towards improved legitimacy, though it's hard to predict what form that might take (some kinds of democratization are clearly available). I think you might be taking a short-term view of what will still turn out to be a transitional state when seen more broadly.