Well, generally I think you can only feel the ability in women who have the spark naturally. The Sul'dam don't have the spark (those are the damane), but instead, can be trained. I think if they were trained, then others would feel the resonance (or whatever it is). I didn't remember the Aviendha quote, but perhaps that is a talent specific to her. Rand's girls are all full of surprises. As to the future of damane and sul'dam, I would like to think that Mat would play a role in abolishing the a'dams. Wouldn't that just be SO ironic. possible quote, "Burn me! Of course I hate the power... but, well it's just not right, blood and bloody ashes. You could tie them up and leave them for all I care just take those flaming collars off, light Tuon it's just, wrong!" lol, in the old tongue of course.