I think ripple has a great potential for changing the conventional swift like money transfers between financial institutes. This is why big banks and financial companies invest on it.
However, I can`t see that ripple can be over 100$. Because the reason of ripple is to lower the cost of transfers inter banks. The average transaction cost is 0.02 Ripple right now. It may be higher or lower in future.
But make it same amount and calculate. If Ripple price hits 100$, a transfer cost will hit 2$. I think it is higher than current money transfer cost of inter banks. So Ripple may be 50$ which makes 1$ the transfer fee and that is all. I dont see any upper target in terms of this approach.