Why "never really took off"? It's quite widespread in MS-related enterprise world. And it provides a lot of value there. It's just it wasn't adopted widely by the others because of different reasons
Well, I suppose that's a relative judgement. I agree it is more widely used in the MS-related world.
In my thinking, "taking off" would have been if the rest of the ecosystem had embraced it. OData is shared as an open standard (http://www.odata.org), but there is something about it where I still haven't seen the broader ecosystem embrace it (although certainly many have adopted some of the style of OData REST endpoints). That said, compared to where it was when it first came out, OData is still getting a lot of attention. I think opening up the tech is what kept it alive, to be honest.
In my thinking, "taking off" would have been if the rest of the ecosystem had embraced it. OData is shared as an open standard (http://www.odata.org), but there is something about it where I still haven't seen the broader ecosystem embrace it (although certainly many have adopted some of the style of OData REST endpoints). That said, compared to where it was when it first came out, OData is still getting a lot of attention. I think opening up the tech is what kept it alive, to be honest.
Just for kicks, I did a Google trends comparing OData nd GraphQL, kind of interesting: https://trends.google.com/trends/explore?q=odata,graphql