Companies will use the OST token to tokenize their economy. To mint their own branded token (BT) they'll have to stake a corresponding amount of OST token.(according to the ratio they chosed when creating the BT) So market cap of OST tokens = combined market cap of each BT economy + value of unstacked OST tokens.
They're definitively delivering. Some partners started to mint tokens on mainnet (alpha).
Draft of OpenST Mosaic paper, “Running Meta-Blockchains to Scale Decentralized Applications"
https://medium.com/ostdotcom/openst-mosaic-paper-released-fo...