About that mixing races into a boring one, the main threat, I think, comes from the future manipulation of genes. if the parents will like a well-known woman or man perhaps they'll want their child look like or identical. you'll walk on street and meet with 10-15 Elvis
about the gay marriage, I think they'll gain this right in the near future, but of course, they'll want more, to be married in church. I wanna see how long the church will resist to the pressure of the modern society
because allowing the gay marriage contradicts with categorizing homosexuality as a sin. Difficult times for the church: women priests, gay marriage, all it need is receiving a message from space and cohorts of priests will land on the doors of labour offices
... but, as i remember, there's nothing in the original God's or Jesus' words being against homosexuality, so, there is a little door for the church to escape through.