"Fiscally conservative and socially liberal" voters certainly are small "L" libertatians. The article was primarily dealing with libertarians not members of the Libertarian Party.
>>small "L" libertatians
Winning elections is about creating coalitions. Without the libertarians (fiscal conservative, social liberal), the Republicans will not win. That doesn't mean that the Republicans have to nominate libertarian candidates, just nominate someone who doesn't scare off the libertarian voters.
Here in Republican bedrock country, Kansas, we are seeing this play out. This past election cycle, we lost two good men, Phill Kline, state AG, and Jim Ryun, 2nd district Congressman because the libertarian vote went to the Democrat candidates (both defections from the Republican Party). Our Lt. Gov. (who ran with Kathleen Sebelius) is also a Republican defection. I'm concerned that similar dynamics might play out on the national scene as the libertarian vote aligns with the Democrat party more often than not.