I've been feeling this lately too. I have one P style 4 string and one J style 4 string. Both have their places, but the P gets much more use in bands and the J is fun to practice on. I also have a 5 string version of the J that I'm thinking I'll never really use. I bought it in case I had to play a gig where I needed a 5. I put that one in the closet the other day as an experiment to see how long it would take until I really needed that bass for something. If I hit 6 months with no use, I'm selling it.
I wish I could do just one bass, but I'm scared of needing a backup and not having one.
I wish I could do just one bass, but I'm scared of needing a backup and not having one.