I would say its a sign that the Conservatives wants a leader NOT from Alberta. If you look at federal leaders, the Conservatives had the most geographic diversity in their leaders.
The Conservative Party has had only one leader - from Alberta - so it's a little premature to say that they have the most geographic diversity. I'd say the jury is out on that one.
As for their predecessor parties, the Reform/Canadian Alliance has a leader from Alberta, followed by an Albertan who was parachuted into a safe BC riding, followed by yet another Albertan. From a leadership perspective, they are probably the least geographically diverse party of modern times - worse than even the Liberals.
The Progressive Conservatives, in contrast, did have quite a bit of geographic diversity in their leaders - starting in 1970 (I have no intention of going back to 1867, and picked an arbitrary start to the modern political era), the PCs had leaders from Nova Scotia, Alberta, Quebec, BC, Quebec, Alberta and then Nova Scotia - that's 4 different provinces (in comparison, the Liberals since 1970 have only had leaders from Quebec and Ontario, plus one BCer who represented a riding in BC while leader but at times also represented ridings in Quebec and Ontario). The PCs, of course, remain the only party to have had a woman PM (although the NDP has had two female leaders).
It's actually the NDP that has had the most geographic diversity in their leaders since 1970, with 5 provinces/territories represented - Saskatchewan, Ontario, Ontario, Yukon, Nova Scotia, Ontario, and Quebec. Although if I had pushed to start date back to, say, 1965, Dief would still have been in charge over at the PCs, and would have tied the NDP. The NDP is the only party to have had a leader elected to a riding in one of the territories.
I didn't count interim leaders, since they are caretakers usually chosen because they won't ever be permanent leader and to give the least offense to various party factions.