Nothing has changed in marriages, the only difference is that now the lower class has a "voice" and is able to trumpet their beliefs as being the truth.
Yes, divorce rates are 50%, but like any statistic, there's a whole lot more going on behind those numbers than just "half of all marriages end in divorce". For a college educated person marrying a college educated person, with both partners entering into their first marriage, the divorce rate is less than 7%.
50 years ago, there wasn't "social media." The uneducated, trashy masses didn't have a vehicle (facebook, twitter) to hop on and tell their friends "half of all marriages end in divorce, imma do me and get this money, i don't need no man." The type of man that enters into a successful marriage isn't scraping at the bottom of the barrel to marry girls like that--they're already married, working their way up the corporate ladder, fixing up their home (that they own) on the weekend.
It's like obesity, or watching American Idol-- "divorce" is something that the lower class thinks is the norm, or it's a trending new fad. But the healthy, skinny, well educated people making the money and driving the nice cars aren't getting divorced, they're tipping you for pumping their gas.
Sorry, truth hurts.