You would only "need" a fiver if you're playing a style of music that calls for notes from all five strings, over the course of a gig if not in each individual tune. It can definitely be useful in prog metal, modern country, and some pop. And the OP doesn't say. But as most of the more sensible people have said, only you can decide if a 5er suits you or not.
My own history - I started on a 5er very early on, it was my first gigging bass (though not my very first bass) and I thought of myself as an exclusive 5-string player for a long time. Then I got a 4 just out of a nagging feeling like I wanted the "classic." Then I got into a classic rock band where none of the songs needed the B string and a 4 just seemed to fit the image better. Wound up with a couple of 4s I really liked and they became my main players. I still have the 5ers and pull them out from time to time, though, like on a recent couple of sub gigs that needed the lower notes. It never hurts to have one in the stable if you fancy a different ride from time to time.
Nathan East?
Or I'm sorry, did you mean only the greatest players from the era before the 5-string became widely available?
Amen.
I have a Yamaha BB415 that cost $300 and am utterly thrilled with it. Never letting that girl go.
I understood we were replying to the Posters original question about 5-strings and not just disagreeing on other peoples opinion? ... Maybe join the conversation and tell the poster why you feel his need to own a 5-string bass.