Educate them?! Why? Do they want to use Subversion or any other non DVCS? Fine, let them do that! Sometimes it may not even be a technical problem at all; it may just be their taste or it's just that they simply don't need anything more than what they already have. Either way, DVCS are out there, so if they need them, they're gonna use them sooner or later, but they certainly don't need to be educated.