Unless Kristol actually has Romney or an incumbent Senator/Governor (and the fact that we're down to random House people being bantered about shows this probably isn't the case), he needs to face that Gary Johnson, while not as interventionist as him, is much closer to his views than Clinton or Trump and is eminently qualified to be President. Recruiting a fourth candidate who isn't meaningfully better known just reinforces the duopoly.
This is probably the best shot at actually winning electoral votes that the Libertarian party has ever had. This is the kind of year that 3rd parties dream of.