Harper's a wonkish, intellectual type: the numbers speak for themselves. However assuming this is the case and everything else goes according to OTL, there's a good chance that the Tories will not reunite for another decade or so. Eventually they'll have to, on the same terms (a Blue takeover, unflinching acceptance) but under a different leader. If he does become a Liberal than he'll be part of their centrist wing and probably throw in with Martin over Chretien as a Cabinet minister. So instead of Iggy, you could have Harper as leader once Dion implodes.