I've recently bought and then sold a large bit of gear. Macro set ups, flash, medium and large formats and I'm whittling it down now to the stuff that I like to use the most.
If I had unlimited funds and space, sure, I'd keep some more of it than I am. Alas, I don't, so a bunch is moving on to new homes. I'm not much of one for triplicate backups being a valid reason for keeping it though...not to say I'm judging you on that decision, but my brain would start asking if it wouldn't make more sense to sell it now and buy it again later *if* you end up needing to.
I get camera confused quite easily, so having more options ends up seeing me shoot less and worse than when I self impose limits of format, film, and lenses.