I can't say much about coffeeshops since I live in the north of the netherlands, but indded january 2013 is the date for the rest of us.
and here in the netherlands it's not like some other places where if there are laws that nobody agrees with it's like the laws are not there. the rules will be followed(a line you hear a lot when growing up in the netherlands, 'regels zijn regels' 'rules are rules' , used as an apology, like 'I'm sorry I have to punish you for this, I agree it's bullshit, but I have to follow the rules'), that's the attitude here in the netherlands. but plenty of people will look for holes in the rules/ways to circumvent it, or maybe even go in protest(altough with us dutchies it's often more talking/whining than actually taking action/doing anything about it)
but unfortunatly our attitude is that once a rule is in place, it will be followed. but reluctantly, so we won't do more then what the law requires us to do. this is one of the things I've always disliked about our culture, if you run into a ridiculous rule you can't discuss it, even if you have valid points and the person of authority agrees with you, the line 'regels zijn regels' is the absolute discussionstopper. and on the other hand we won't do more as what the rules require of us, eventough it would be better if we did a bit more. this can sometimes be really frustrating, since that way ridiculous rules never get changed, even if everyone think they don't make sense.
even our tolerancepolicy fits into this, in another country the same policy may exist withourt regulation, but here in the netherlands we have to make regulations for something of wioch the point is tp not follow the regulation...(the thought behind the tolerancepolicy is that weed is still illegal, but since we agreed it is only a minor thing, the police doesn't prosecute it as long as it happens in a good non-criminal way, in coffeeshops)
so don't count on coffeeshops just ignoring it, unless those coffeeshops announce they will ignore it. if they will, they will make it know in the media, since ignoring the card by shops is done to cause a courtcase, wich they then hope to win, so it's still in a way adhering to regulation and working in the system.
you will find exceptions to this in some circumstances, but this is a common attitude around here and something to consider when trying to predict what wll happen. a lot of us act like we are constantly being watched, even if we are sure we are not. and it's a cause of dwindling privacy, since some people will accuse you if you are in favor of privacy 'do you have something to hide?' 'what does it matter if the government knows everything about you including your DNA-profile if you have nothing to hide/do nothing illegal?'
ofcourse it's a radical generalisation, but to me it seems that this attitude is way less prevalent in other countries, especially more southern countries