Every crypto is niche by definition of decentralization. We are building communities here, and communities don't have to be gigantic to build value. This isn't Facebook where the business model is to extract $10 a year from a billion users. "Social" is itself a niche, so I'm not 100% sure where you're going with that, or why we'd need it to be successful. A single popular dapp could send any crypto to the moon.