It's a problem while you're leveling if things are at different level ranges. I'd imagine it'd also be a bit problematic for people who glamour their rings. It's not a huge issue for me, personally, but I certainly wouldn't complain if they doubled the ring space.

I'd also really, really like an "equip top slot" and "equip bottom slot" option for rings. "Equip" is pretty much useless anytime you're already wearing rings.