I don't think marriage will ever go away, I think people are just able to be more independent now. also Idk about other countries, but in America, getting married at a young age is more a bad idea than a good idea as of late...
people can barely afford to keep themselves afloat considering the prices of everything has skyrocketed since the last generation. it's just a better idea to wait until you have a stable job that pays you enough to where you can consider marriage. and considering that it's more difficult now than ever to get a job right out of college... marriage isn't the first thing on the agenda when it comes to priorities.
People are also realizing that marrying isn't always the solution to everything and that marriage isn't apart of their self-worth.
it doesn't mean that marriage is going away, people are just smarter then they were before about marriage itself...
when it comes to sugar daddies etc, I don't think there's anything wrong with it as long as they're both consenting adults who don't abuse each other... let people do what they want. again... adults, I don't like the idea of minors taking part in stuff like this...