I would suggest going to the banks and asking them about Ripple. I don't think the big banks will use it. If they do use Ripple, they don't need to hold XRP. This is something most XRP hodlers don't seem to understand. I also can't think of a reason why banks wouldn't make their own crypto, as JP Morgan are doing. In the unlikely event that big banks use XRP, I also can't see a reason why they would want it to be a high price, when they don't like volatility and its easy to not hold it and keep the price low.