Will marriage become obsolete with time?

i was thinking about it. the way i see it is that dating is really the "cream" of marraige in the sense when you go out on a date the gf will be clean, in the mood for fun and so will i. after our date (probably dancing in a club following a dinner) we shag our brains out. essentially during dating you seeing your partner in her best mood. after marriage you will see her when she just woke up (scruffy looking) when she is cranky an when she is on her period