Tennis video games seem to be an area where there could be improvement. In an article I read, the author gives 7 reasons why tennis video games could be better today.
Tennis has become more popular in the last few years, but nowhere near football or baseball here in the U.S. Maybe thats why there are so fewer games available? We must remember that this is not a team game. This is either singles or doubles, which would make a game completely different and you are not going to be in a forum of players with the social activity we find with other sports, or other games for that matter.
As the sport becomes more and more popular, it remains to be seen if more tennis games with develop.