If it's going to be a super grindy time sink they use to revive/sustain old content,
if it's going to be a potential gil sink, or crafter's goldmine,
If it's going to require arbitrarily large amounts of items to get, with low drop rates or require numbers of other items to get just for one of them,

NO.

I've been nothing less than vocal in my criticisms and distaste for relic weapons and how they're handled. I'm finally close to completing the 210 step now, and only moreso motivated to just drop it and not bother ever again. You can pretty much count me out on 4.0 and future relics.