The requirements to meet to play (yes, even "real life" uber dangerous sports are just games) with others and compete shouldnt be the main reference to decide if an activity can be labeled as a sport. A skilled sport is not necessarily a dangerous one, nor should it require physical fitness.
Games are just that, a combat of skill in a particular domain. So if you're looking at it objectively, anything can be a sport as long as it provide fair ground for people to meet and compete to see who is the best. Then if people are interested or not in it is another thing.
Now of course, personally, I'm more interested in real life, physically challenging, life threatening sport... But being a video gamer, I am also naturally going to say that eSports are interesting, especially when you play and understand the game yourself.