Thankfully unlike ripple most cryptocurrencies are built to be decentralized and open sourced. Even if the original company or founders decide to abandon ship, the distributed ledger will still be in place and can't be erased. Prices can always change with an accompanying change in demand. As an investor this is something you should always keep in mind. If a project is used in too specific of a niche or business, it makes it a riskier investment.