150 points in the 1980s. Considering a guy like Bernie Nicholls was able to do it, do you really think it's a stretch that Crosby could reach that mark a handful of times during his peak?
You say that like everyone dropped 150. Even in the 80s, a grand total of only four (4) players managed this feat. That one of them was a seemingly random name (who was actually a pretty damn good player) having his Gretzky-fueled, perfect storm mega-peak season didn't suddenly mean it was routine or easy to accomplish.