Well, I think it's obvious, everybody agrees, that the objective is to get people with empty profiles to fill them out.
Re: "Could we move this discussion in a group " - Moving this discussion into a technical group might be good (though I don't see it as a technical but strategic problem), but only if at the same time the people with empty profiles are made aware of their non-participatory nature, and encouraged, moved, persuaded, obliged, or otherwise manipulated into doing something.
So, why don't you send them a message with a copy or summary of our discussion? There's no point in our discussing this if it remains within our closed circle.
It's not necessary to have ALL the sections of the profiles filled out. Of course there should be some leeway.
To anyone even considering joining BW it's a complete turn off to see so many black mickey mouse signs (the icons for profiles without photos), and then even more so if you click on them and there's no text, etc. So why do they appear in the first place? I think you should have a minimum data before any profile can be activated from the beginning. A minimum is just that, a minimum. Everyone is free to add then as much as they want after that.
Another point is whether BW should do more to promote itself. I think it should, but I've noticed there is a general feeling here against that because it would supposedly make us more "commercial" or popular and that is taboo for some strange reason. So we remain "pure" in that sense but if we die, no one will notice it. What a smug attitude. Are there no marketing people out there who would know how to get the word out that BW exists? My critique is that the mere mention of "marketing" ellicits here negative comments and reactions. I'm not talking about selling anything; maybe publizing is a better word?
Anyway, before you even think of attracting people to have a look at the site, it has to be "washed" and put into tip-top shape for the newcomers to have the feeling that there are meaningful and interesting profiles in it.