I've been thinking about this recently. I've had a massive clearout of basses I thought I would never part with (my Bravewood J for example). The key thing that has made me focus on one electric (my Rickenbacker) is recording an album with my band. We decided to track very quickly with the same gear to give the album a single, unified character and it really worked. So I'm now down to a double bass and a Rickenbacker which is an unusual situation for me. I just felt I didn;t need the other basses.
It reminds me of when I was in a touring band back in the mid nineties. I was not so worried about the bass itself etc (it was a stingray so it sounded like a Ray and felt chunky and was slightly heavy ha ha) but I was obsessed with getting a good tone with what I had i.e. the bass and an SVT rig and the bass not breaking from all the abuse. I had a J bass as a backup but I never played it.
Throughout the entire period (a couple of years) I never even thought about buying basses. The bass was a tool, not a fetish object.
Fast forward 15 yrs and here I am with more means at my disposal and a very semi pro attitude to music and I'm going through basses like water so I've decided to boil it down to a single electirc and a DB.
Of course, I do have an ADAMOVIC on order...aha ha ha ha... But that's another story...aha ha ha