I only use XRP to transfer funds due to its cheap transaction fees and its fast confirmation times. I haven't really thought about buying XRP for investment purposes, as it's a centralized coin controlled by a company and every aspect of its development is highly influenced by those within the company. Ripple Labs doesn't really listen to a lot of suggestions from its community, and that's scary because the community is the one responsible for posting value to the said coin.
I don't get why some people take XRP as a serious investment, especially when it's a centralized coin. Trusting XRP would be no different than trusting banks. I get that money transfers are dirt-cheap and fast, but it's not worth it when you could lose everything in an instant. Instead of XRP, why not consider Stellar (XLM)? It's basically the same design as XRP, except that the community is the one in-charge of the project. No company controls a large portion of the token's supply unlike XRP.
Still, XLM is not as popular as other cryptocurrencies such as ETH, BTC, and DOGE. These last ones are much more decentralized and censorship-resistant. Ultimately, the market will decide which coins stay afloat and which ones will fade into oblivion. As long as there's healthy competition in the crypto/Blockchain industry, nothing else matters. Just my opinion