Well, Gary Johnson is a proponent for legalizing all drugs and open borders and he's an interesting character as well but Light is right - Gary is drawing support mostly from Hillary but I don't think he will get much more of the popular vote than when he ran in 2012, something nobody really talks about. That time, he got around 1,275,000 votes and Jill Stein (who just got arrested on purpose) was in the mix again.
Picking Weld for his VP was questionable for a libertarian. Frankly, I don't care for Gary Johnson, he is a hothead. The libertarian he beat wouldn't endorse him (echos of Ted Cruz) but tried to give Gary a replica of a pistol used by George Washington. Gary just threw it in the trash can. Somebody saw him do that and fished it out and gave it back to Peterson.
He could always back to being the CEO of a pothead company after the election, deep but narrow political appeal.