I think Aikido definitely loses prospective students to the martial arts that are deemed successful because of the UFC. Aikido hasn't been proven effective in the eyes of the public. However, its interesting to notice that Steven Seagal has made a pretty big presence working with some of UFCs top fighters (Anderson Silva, Lyoto Machida). Unfortunately, he has that self-aggrandizing attitude that make him seem a joke to many in the sport.
I personally find him entertaining and obviously respect his aikido ability. Despite everything, I'm glad he's made a friend of Silva and train together. Whatever some may say in the UFC, Anderson obviously finds some value in having Seagal around.
For those who haven't seen this training clip with Seagal/Silva, have a look: