Not sure how much this has been discussed here but what part do you think Tysha will play from here on. I thought GRRM was just using her to make Tyrion kill his dad but in DWD he is looking for her. I think it is unlikely that Tysha is ever found but GRRM seems to keep bringing her up so I think something else is going to happen with her.
No role. She matters in Tyrion's mind obviously but he'll never find her and doesn't really expect to
She's not playing any role anymore. She was only brought up because Shae's betrayal and killing his father has kind of fucked Tyrion up mentally a bit. He's not really looking for Tysha, he's just kind of repeating that line.