They should because they'll make the atmosphere hot.
It's kind of like title IX in college sports. They have men and womens everything else, and to not just have a womens hockey team doesn't make sense. Besides the USA womens hockey team is good, so I'm not complaining.
I don't think a sport so one sided should be in the Olympics. Teams are basically playing for bronze. The games aren't even fun to watch. 18-0? Get this out of the Olympics. Until countries can at least compete with Canada/U.S.A (4-3, 5-3 games), leave it out of the Olympics.