I dunno, I have to say tho, there are semi-legitimate reasons for a non-lifelong marraige. I'd completely agree that marraige ain't taken as seriously as it should be, but people do change, and people do make mistakes.
Marraige is by definition a very emotional thing, and emotional is the opposite of rational. Sometimes decisions made very emotionally are not the ones that one would make rationally. I'm sure that everyone here, myself included, has often done things while very emotional that they normally wouldn't.
For that reason, I'd be rather leary of viewing marraige as a one-way ticket, just because people do stupid things, marryin' people that they don't like is one of 'em. Few years back, my uncle married this complete psycho bitch. Dunno why. They got divorced a few years later. I never liked her. But my uncle is a nice guy. He fucked up pretty badly when he married her, but I wouldn't want him stuck with that bitch for the rest of his life.
Of course, it's now viewed as somethin' that's instantly and completely reversible, and that ain't right either. That's why we have dating, to try 'em on, see if you like 'em.
Rather, I'd say a happy medium is in order. Think of it like a plane ride. You got a parachute and you can jump out in the middle, but it should only be used in legitimate emergencies, like if the plane crashes. If you don't like the inflight movie, or they gave you peanuts instead of pretzels, that ain't a good reason to use the parachute.
Then again, what the hell do I know, I'm just some kid from New Jersey.