Nobody talks about slavery anymore, and yet it was a topic of intense debate in 18th and 19th century.
Which of today's behaviors you think will be seen as immoral in future?
My bet is that eating animals will be seen in disbelief by our descendents.
This is why a change in moral framework is first resisted by the society at large.
So notice what minority is talking about today. Their voices will determine society's behavior tomorrow.