It really is a rough call. Considering 70% of cats in shelters are put down, and the leading reason for people putting their cats in shelters is due to them clawing up the furniture.... well...
In a perfect world, I would say no declawing. It should be a last resort. I have a 10 year old cat who was declawed when he was a kitten and he still is very sensitive about his feet. Of course the surgery has improved since then, but I can still see it's a painful process. All of our cats we have raised ourselves are not declawed. We work with them to prevent clawing of the furniture. Not every cat responds to that training though, and not everyone is willing to train.
If it means saving the life of the cat, I can understand declawing. It shouldn't even come to that though. But yet, it does. No one ever picks up cats from shelters. Especially not cats who are adults.