Obviously, if the kid dominates at camp, there's a different discussion happening.
However, with the bigger role projected for Reinbacher this season in Kloten -- and a coaching staff there that was an integral part of Reinbacher's rise in the draft rankings, allowing him to handle more responsibilities as he appeared ready to do as much -- I doubt that the situation in the Swiss League, a high caliber league won't lead to a natural progression for the kid.
Not all European players need a long framework to adapt to North-American ice. For some, it plays better into their game style and, for Reinbacher, who excels attacking away the Gap on larger ice surfaces, the smaller ice surface could become an advantage for him.
I'm not against Reinbacher playing in Laval this upcoming season, from a hockey player perspective, but, from a human perspective, for an 18-yr-old, I think that playing away from Montreal's limelight for one more season, albeit in a good league with good coaching, but only 1 hour away from his home in Austria, can be a good environment in which to continue developing.