Well to the OP, I say play whatever you want to play (as long as you don't have an "I serve the devil" sticker on the front lol!).
I don't know about everyone else's experience with gospel bass players following trends, but all the players I know stick with one bass or one type of bass (Jazz, Smith, Ibanez soapbars, etc...). And even if they do follow trends, who cares? Is it not like you seeing your favorite bass player live and wanting to play/sound like him/her while playing the same equipment? I've wanted a Ken Smith since I started playing bass almost 7 years ago. The main reason is because my favorite gospel artist, Fred Hammond played one on the "Purpose by Design" concert DVD. To me, the sound was unbelievable!! When I finally had a chance to play one for the first time I fell in love. It was the best feeling and sounding bass I've ever played, AND my favorite gospel artist/bass player plays one lol!
I understand some people just have to have the newest or most popular, but I'd like to think that they are a localized group;they do not, and can not, represent an entire genre of bass players.
Back to the OP, I've never played a P bass, I've always wondered what the Deluxe P bass (I think it's a 5 string) sounds like....