A few years (or maybe even months) from now, we will look back at blocking SD like rearranging deck chairs on the Titanic. SD may be shady and abusive, but WELCOME TO THE JUNGLE BABY! Personal feelings and vendettas about inappropriate uses of the blockchain are going to look really silly when serious volume and attacks are unleashed at a dizzying pace in this exponential growth environment.
Indeed, I dont think SD is causing problem, just an idea of waht's incomming, as BTC will gain more and more users. IMO, SD TX represents a very small fraction of the TX volume the BTC network will have to deal with. BTC must evolve, because as it is right now, it will not be able to deal with the exponential growth comming. Another tought, fees will be more and more important as the growth occurs, and halvings happens.