The most painful part of what you've decided isn't having to re-level. Regular players will do that pretty quickly. Especially if they can only upgrade one or two per week. The most painful part is LOSING the signature perk. Many of the exotics really don't "come alive" until you get that signature. Because of that, I almost certainly won't be upgrading Bad Juju. While the increase in magazine size from a 5- to an 8-firing cycle size is an improvement, it will still be an excruiating process that will (once again) make the weapon useless for high-level play...and there are just so many better weapons in the game at this point that it doesn't make sense to go through that again. Never thought I'd say this---pre-buff---but I'm less concerned about having to re-level Super Good Advice than I am about Bad Juju. So you're looking at re-creating the problem that this week's patch was intended to fix. People tossing exotics into their vaults (or breaking them down for materials) because using them just isn't worth the effort.