There must be a fine line
I think there must be a very fine line between having patience to wait for an opportunity to gracefully, gently step in and "plant a seed," and on the other hand to become so passive we are doormats.
Let's not fall into the trap that we ourselves can be Do-ers and Do Something that will cause Foster to change his mind. It's HIS mind. He can do with it what he pleases, and it's a mistake to believe, however infinitely possible change may be, that WE can be what causes someone else to change.
We can only watch, wait, "plant seeds" if it seems appropriate, but ultimately we take care of ourselves, not the Fosters and Bennetts of the world. If these guys reverse stance - I would betcha, were I a gambling type - it would be ten times more likely to be because a sibling or child comes out gay/lesbian, or because they witness first-hand some horrific outcome of ex-gay therapies, like a suicice, in someone that they know, or because of a "downfall" such as being so overcome by same sex attractions they finally act on them, or because of a sudden and mysteriously powerful dream. . .something like that. I'd say our role in dealing with these guys is relatively small. Mainly, it's a wait and see game - wait and see if a situation presents itself where it becomes apparent that we are the ones to step in, rather than attempting to *create* it.
Clear as mud?