> Bitcoin Cash is fast and as low fees but if it manages to scale to something like a Visa network number of transactions, it will be centralized

This just isn't true. Today's commodity hardware can already process gigabyte blocks[1], which corresponds to approximately 3000 tx/s globally. In addition, Moore's and Nielsen's laws will bring down the cost of cpu power and bandwidth, and will enable terrabyte-sized blocks within the next decade or two - all while still running on commodity hardware.

[1] https://news.bitcoin.com/gigablock-testnet-researchers-mine-...