Filecoin

The major reason that is stopping IPFS from becoming a decentralized filesystem is that nodes only store the files they need. Filecoin is a decentralized filesystem similar to IPFS with an internal currency to incentivize nodes to store files, thus increasing file availability and making it more like a filesystem.

Nodes in the network will earn Filecoins to rent disk space, and to store/retrieve files, you need to spend Filecoins.

Along with IPFS technologies, Filecoin uses the blockchain data structure and the proof-of- retrievability consensus protocol.

At the time of writing this, Filecoin is still under development, so many things are still unclear.