Blockchain tech is not too slow. Ripple is centralised and basically central banking 2.0. as far as I'm concerned.
The banks are only interested if they can control the blockchain network and token. The problem is, once there is a public blockchain out there, it will probably out compete most private blockchains. The owners of private blockchains then tie themselves into knots trying to attract network participants............
Thanks @benjojo, have you read our report on how Russia could save Ethereum? > https://steemit.com/steemit/@blockrush/8-compelling-reasons-why-russia-must-legalize-bitcoin-and-icos-blockrush