Maharincess and Fliptopbox, I agree with you both. I'm in a long, unmarried relationship as well and we're just fine. Maybe we'll get married one day, maybe not.
It's OK if 2 people in a relationship don't want marriage and its OK if they both do, but if one wants marriage and the other has to be forced into it, I don't see it lasting. He'll resent her for pushing him into it and she'll always wonder if the only reason they're married is because she forced it.
Doesn't seem like a happy future to me.