I think there are a lot more people nowadays that are open to new and changing possibilities than there were in 'bygone eras.'
{edit} Just to add, I think this is because newer generations are growing up in a world where things are increasingly in flux; whereas older generations grew up in much more stagnant times (with respect to social and technological progress). {/edit}
Everyone thinks they're open-minded about change, because they only see a relatively small amount of social change in their lives. I wish we could revisit this discussion when we get old though, because I suspect many of our ideas and taboos will seem silly and be routinely flouted by future generations.
Maybe the 'general population' but I, personally, am accepting of a great many things. But I guess if we went into reverse social change I would have a hard time living in a society with slavery reinstated... But in general, I'm disappointed with the lack of social changes in many aspects of society today.
I didn't mean to imply that you weren't. I think there are people living today who would get along fine living in the year 2189. But even a progressive in today's society usually wants a specific set of changes that are orthogonal or even opposed to changes that may come in the future. The comeback of polygamy (now billed as "polyamory") in some circles would have come as a shock to the generations that abolished polygamy.
{edit} Just to add, I think this is because newer generations are growing up in a world where things are increasingly in flux; whereas older generations grew up in much more stagnant times (with respect to social and technological progress). {/edit}