Well it very well could have if things went a little different. Bittorrent was revolutionary, but slow to adapt. Maybe if it was more user friendly, or had more browser integration earlier on, and the protocol had more development, you'd see it more widely used. Imagine if "the cloud" was just bittorrent swarms. It could have happened. As for blockchain...decentralized databases have their place, the problem is that centralized organizations are trying to make a use for them when a centralized db already did what they wanted just fine.