Yes, Hayley has been very influential. She has influenced me to pick up my guitar and actually learn how to play it. She has also influenced me to do what I love and to take things more lightly. Basically to sum it up Hayley is my role model.
If Hayley did ever leave Paramore it would be a big blow to everyone I think. I would support Hayley and I would support Josh, Zac, and Jeremy with what ever else it was that they wanted to do.