I think you have to be a bit less simplistic in your approach.
Even those people who choose not to share may be doing that because they're nervous about using p2p...how many people do you think are just plain scared of being prosecuted? Are you going to tell them that they have nothing to worry about? Out of all those people, there are those who will start to share files...once they're familiar with whatever cilent they're using & feel a bit more comfortable with the whole concept of p2p.
If they were told from day one that they have to share, or they're not allowed to use the client...they'd run a mile & I wouldn't blame them. That would be the network's loss.
There are always going to be freeloaders...fact of life. But to be so militant about forcing people to share would only harm the client & p2p in general.