The Sassy Lawyer has an entry on the possibility of "performing arts schools" in response to the Japanese government's stricter immigration policies.
For the Arroyo government to plead for a moratorium at this point is rather hypocritical, considering the fact that it -- and the different administrations prior -- has basically facilitated human trafficking in the first place.
We all know as well that OPAs in Japan are not primarily hired for performance, so the entire ARB/ACC process is in many ways a constructed governmental hurdle (and OPA as more or less a fictive category*) that also makes it easy for money to be made illegally. Nothing like bureaucracies to give what is essentially a reprehensible practice (on the part of the government) the veneer of respectability and morality.
The article the Sassy Lawyer linked to does not mention anything about Japan (or the Philippines, for that matter) doing anything punitive about human traffickers; the people who will be bearing the brunt of the new hiring regulations will be the Filipinas themselves, as they are now viewed by the state as being illegal aliens. Most of the statements coming from DOLE at this point have been almost consistently downplaying the human trafficking aspect, making it seem that it is really most anxious about the loss of remittances, and not the welfare of the OPAs.
*This, of course, does not mean that the OPAs in Japan do not sing and dance, but in the few interviews I've conducted with returning OPAs make it clear that this occupies a relatively small percentage of their work duties.