Unless you subscribe to the less is more school of thought, therefore, less is better. Combine the 2 and we have a nice infinite, self perpetuating loop. (Sorry, I’ve been in the DoI thread and become more obtuse than normal).
Get on topic, Ez! Ahem...
Downsizing to one is a noble quest and by ordering a bass that covers many bases (pun intended) you could achieve your goal. However, what you could end up with is a very bass that will do everything, but doesn’t do any one brilliantly. You say you gravitate to one bass, what sort of bass is that? Do you pick up the others at all, if so, which one/s and why? It could be that downsizing to 2 would salve your conscience and free up some cash (if required). Perhaps try putting the less used ones away in cases and out of easy reach for a couple months and see if you miss/needed them?
Ultimately, this is Basschat and GAS rules. Therefore, don’t downsize, buy more! 😁*
*please feel free to ignore paragraphs 1, 2 & 4