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It's very hard to predict based on current trends. Somebody gave the Roman example earlier. In Japan, many men, especially Samurais, had boy lovers. The Victorian era saw a general conservative trend. Americans' resistance to abortion is increasing so that it's about 50-50 now.
Remember that before same sex marriage advocates discovered the benefits of matrimony, some, maybe the same people, predicted the end of marriage (it was an oppressive institution, etc.). The equal rights ammendments didn't pass.
Some parts of Europe may see a demographic shift in the next 100-150 years that might (who knows for sure?) reverse many of the changes in social morays.
As for what people will think. I guess it depends on whether people decide things based on some permanent principle or what's accepted during their time.
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