I know I'm not the only person here who wavers between obsessing about Their Next Bass, Which Will Be Perfect™, and contemplating selling everything and sticking the money into their house or 401k or whatever.
I'm in such a valley at the moment. I recently went through obsessively partscaster-ing some guitars, upgrading a couple of very nice Fujigen-made basses, rebuilding my bass and guitar pedalboards, and...once that was completed, I realized I've just been upgrading-and-trading in a constant cycle, yet haven't actually been motivated to play at all. For years.
One side of this debate: Sell everything, walk away, stop digging myself into a financial hole for the privilege of temporarily owning some nice instruments.
The other side of that debate: Get just one quality, stock bass to practice and explore my own sound, keep one guitar, maybe get a Bass VI style instrument down the road, but either way, keep them for at least 5 years before I decide what to do with them.
(On that note, the bass I'm considering would be the Ibanez EHB1005SMS (short multiscale). I think it hits everything I've been looking for - ergonomics, light weight, shorter scale, and most of the demos I've heard are pretty fantastic. I might be actually motivated to practice, especially learning to navigate a low B.)
Thoughts?
While I understand - and sympathize - with your situation, I have to say that my bass owning journey has been... just a
little different.
While I currently own 22 basses (plus 3 or 4 guitars, and an old, obscure long scale banjo), You couldn't really call my situation GAS. Over-compensating for being deprived as a child, maybe; but, not really GAS. Being incurably left handed, and being born while Harry S. Truman was still President, meant that, much as I wanted to play bass (never wanted a guitar), there simply weren't any to be had - that weren't special order/custom. And my family just couldn't afford that kind of thing... So, when I became old enough to buy my own bass guitar - and there were actual, production left handed basses to buy? Yeah, I admit to going... maybe just a little overboard.
However, I was methodical about it. 30-some years ago I made a list of the particular basses; brands of basses; and types of basses that I wanted. The rule that no bass could fill more than one spot (my '01 Rickenbacker 4003, for example, could fill the "4003 Rick" spot, or the "Long scale neck-thru" spot - but not both) is the main reason I have so many. In any case; finding lefty basses that filled all the spots took a long time (a couple of them are
probably not replaceable, as well), but I completed the herd, early last March. So, my bass buying days are over. And, I can't say I'm sorry, either...
As for playing them? Yes, I do play them -
all of them. Even the banjo; although I seem to spend more time tuning than playing it...

Aside from 2 basses and a guitar that live out on stands, the rest rotate out of "storage", 3 at a time, for a month of maintenance and playing before they get cleaned, and returned to their cases. Until they come out again, in about 6 months. It's definitely a chore, but; hey, I'm retired. And it's a nice break from being dragged out to the golf course - which, if my friends had their way, is where I'd be 5 days a week. Besides; it actually rains here, so I can't ride my Harley as often as I did, when I lived in Las Vegas...
Giving them all up - and walking away? That's my usual answer to all the "If you could only have one bass..." threads. Sell
EVERYTHING: load up my Harley with just enough for life on the road; and become a homeless road warrior... And, to be perfectly honest? I have thought - very seriously - about doing just that. More than once, too. I've done the research - and the math; I could, actually, do it very easily... But, I'm thinking; "Nah; not quite yet..."
Finally; actually
doing the "you can have only one" thing? Yeah, it's certainly doable, I guess... But, for me? Which one of the basses that I've spent half my life acquiring, would it be? There really isn't a real, #1, all-time favorite in the herd; even though I've always said that my '73 Rick 4001 was. And, it
did sit next to the amp for many more years than any of the others. But, it's one of the little batch of "extra" basses that I acquired along the way - and that I'm selling. Yes, it
could fill the "long scale neck-thru" spot; but TBH? The bass filling that spot right now, is a better one for that role. I'll miss it when it goes, but - I don't think I'll miss it all that much... So, bottom line?
For you? Yeah, it does sound like "just one Bass" may be the way to go. It will certainly focus your attention on the playing, rather than the getting/selling/getting another one thing. Which, in the end, is what GAS really boils down to. As for the "sell everything" scenario? If you're really a musician, I really can't see that as an option. It would - probably - work for me, because like I've said lots of times; "I'm not a musician who also likes motorcycles. I'm a BIKER who also likes to play bass guitar". In any case; good luck with whatever you decide to do...

