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The origin of the "civil union" was to give gays the same rights as heterosexual married couples but without using the word "married", which the Christian church feels to have proprietary rights over. It actually doesn't give the same rights, it gives less.
A homosexual couple cannot get married, a heterosexual couple can get married or have a civil union. Since a civil union has many disadvantages and NO advantages over marriage, why would they?
Just because 2 gay men live together, it is not just a cost free option to take advantage of the system, it comes with certain obligations as well. This is why both gay and hetero couples who are not sure about their devotion are not "united", they want to be able to leave free and clear, if they desire.