The thing that I like the most about the rule change is that it applies to "licence holders". By contrast, the UCI anti-doping rules as they stand apply almost exclusively to "riders", with only tampering and that type of offence applying to licence holders. So finally there's a piece of anti-drug legislation that recognises that there's a whole system behind drugs in sports and is now looking at the role that team managers, doctors and soigneurs play in the whole process - rather than just villifying the riders.
Yes, I realise that the rider has the final choice about drugs. But I've got enough friends who tell me stories of what they were given or told to take by managers/doctors/soigneurs - and the consequences for their stay on the team if they didn't - to know that the rider is just the tip of a systemic problem.
Like MJM has said, policing the policy is going to be interesting. That said, I wonder if some of the reason for drafting the rules as they are - ie., in terms of licence holders and making aiding and abetting an offence - is to hopefully encourage riders who breach the rule to "turn Queen's evidence" and start pointing fingers at the sources of their needles/drugs?