My idea is only to prevent signature spammer. We only can hope member and merit source be careful when sending merit to thread whose created by newbie so those farmed account rank remain newbie and not too beneficial for the farmer.
This has been discussed many times before, but also tackling it from a campaign manager point of view also. Possibly, being a little more strict, and banning campaigns if they prove the be problematic. I believe theymos is overwhelmingly against removing signature campaigns all together, but I wouldn't be surprised if it continues the way it is he will eventually lose his patience. This is just speculation on my end, but I imagine a few things will be reintroduced to try, and prevent removing it altogether, especially the way that altcoin related signature campaigns are operating right now.