there is absolutly nothing wrong with keeping it simple, some people are actually looking for that, but it is good to be versitle. Don't get so caught up in keeping it simple that you bring nothing to the song, a lot of musicians want to play with someone that can throw something into a dead spot of a song, be it on bass, guitar or what have you. But if all you have is an old school style, there is only so much you can do, and a limited number of musicians you can play for, peace!