Last year I thought the 66.5 over/under was really soft and wished I could back up that belief with a bet in Vegas. This year I would be scared to bet on 72.5 either way (and it turned out the bookies knew what they were talking about in terms of run differential).
So yeah, 75 or even 80 wins could happen but I think 70 could too.
Just looking at how last year's starting eight finished - particularly the OBPs of Joseph, Galvis and Rupp - combined with the uncertainty of the two corner OF vets, I get the pessimism. Also no guarantee Herrera and Hernandez deliver better seasons. When the team was good for eight weeks it was because of pitching and there is lots of talent, but also lots of questions, in that department too.