To start with, predicting such will be hard because no one knows if it will be in the favour of XRP or if it will be against them; if it is in the favour of XRP then the price will pump because people will fomo to buy and sell at a higher price, those who were once holders but dumped their tokens will buy as well, in all fomo will drive the price really up. While on the other hand, if it turns out to be against XRP, then the price will dump hard, many holders will sell and more exchanges will most likely delist it hence causing more dump in price.
This is just an assumption, but on a more serious note looking at how big XRP is, I think it will be difficult for it to cease to exist or go down the drain just like that, however I think the team will most likely look for a way to savage the situation and save their platform.