I think the tide is, or has, definitively turned against smacking as a discipline technique. The law will probably follow in time. Attitudes usually change well before the law follows.
I agree with everything you say Greeny except that you don't acknowledge that most of the mums on here who do condone smacking, are also probably good and loving mothers, in ways that probably hugely outway the negative impact of the occasional smack. (I'm presuming they're not beating them)
I don't think you ackonwledge the harm your persistent use of the word abuse causes, thereby suggesting these parents are abusers. Smacking is an abusive act, but in most families this would be so outweighed by all the positive stuff, it wouldn't equate to an abusive enbironment.
Stick by your guns on smacking, I think you're right, but at the same time consider the emotions of the people on the other side, they may be wrong on this issue, but I'm sure they love their children just as much as you, and to be labelled an abuser of your own child would cut very deep into any mother. Please consider that.
Spread the love around, that'll get them onside.