GraphQL is finally an API standard that strikes the right balance between simplicity and flexibility and has the potential to be the only query language most developers have to learn – and could therefore fulfil the idea of ODBC.
In regards to other SQL databases, we're currently working on a GraphQL database proxy that turns your database into a GraphQL API. We're starting with MySQL but have other databases like PostgraphQL, SQL Server, Oracle, DynamoDB on the way.