I disagree with all of this. I don't think the guy has ever had a fair chance. Last year he starts getting into his groove only to get kneed by Kevin Porter, and never had a chance to get up to speed afterwards, not to mention playing with a Kesler with only one arm. This year he gets a freak groin injury and a freak ankle injury, in between which he plays like an absolute champ and against all odds no pucks go in for him. Give him one full, healthy season, and I think everyone changes their tune.
Additonally, he's the perfect fit for the 2nd line. The point of the 2nd line, the reason it's good, is that it is capable of taking on the opponents' top line so that the Sedins don't have to deal with them. The reason the Sedins aren't scoring as much right now is precisely because they're facing the other team's best players - coming out ahead in AT ALL in that matchup is a win. Booth is one of the best possession players in the league even when he's not scoring, Kesler is a premier defensive forward, and when playing with them, Higgins also excels in that area of the game. Facing them basically means you don't have the puck the majority of the time.
It gets even better for this short period because you have two offensively talented lines - the Roy line and the Sedin line - that can demolish the other team's bottom 9, while the Kesler line shuts down their big guns possession-wise. Booth facilitates this. Unfortunately, he and Kes are hurt so we don't get to see it, at least not until the playoffs.