I think it's a choice.
I did not change my name when I got married. I suppose if we had children, I would change my name to his, if only for the convenience factor of the kid's name(s). But, without kids, I see no particular reason to go through the hassle of changing my name. DH doesn't care. If you want to call me "Mrs. (husband's last name)", then that's okay by me. I respond to just about anything as long as it's not a threat or a slur.
My family always says "I don't care what you call me....just don't call me late for dinner!"