Perhaps not everyone, but definitely most. Most people, from my experience, view divorce as 10% likely. The 'relatively uncommon' statistics you reference above are on the order of 50%. That's a pretty big gap.
You're comparing the general population 50% with Bogus's "at least for mid-to-upper class folks." It makes a big difference, though I don't have statistics in directly comparable form.
Dalrock writes an interesting article related to Dr. Helen Smith's book the Marriage Strike. I really have to bump it up on my too rapidly growing reading list. (^_^)