Marriage just isn't a suitable way of life for the 21st century
And what would be suitable in the 21st. Century? I do believe marriage is much harder today than it was 30 years ago because both men and women have evolved and want more from life in general. I also agree marriage is not for everyone but making a committment to someone, to the best of your ability, is also a personal committment that you will strive to be important to someone other than yourself.
Bottom line...are we simply afraid of failure and use that as a reason to not commit to anyone or anything?