Ok, so why did XRP suddenly hit $3 (and above) in 2017 and went down? I would go with the theory saying that it reached high because banks and businesses shared their positive feedback about XRP. However, the actual adoption and the further domino effect might take 5 to 10 years, but it will (since XRP has already proved to be a reliable tool for cheaper and faster global transactions that can be effectively used by big enterprises). The question is when and how fast they will adopt the new xCurrent framework that takes the process to the next step. Once they do, the domino effect cannot be avoided and the price will hit even above $10. The question is when and how fast. That's why I am pushing for XRP being a long-term investment option now.
You are only taking about the big enterprise but remember they can change their minds anytime and XRP is just a copycat and the trust wasn't there. The huge supply is also an issue here. If i where to make an investment i prefer the smaller supply like bitcoin so the inflation will not kick so much. There are more altcoin which is better than ripple, much cheaper, more faster and trusted altcoin.