There is a couple for go and at least one for rust, although I don't know how well it fares. It shines more with languages which allow first-class runtime reflection and code loading, but you only care if dealing with runtime-configured services. Also WSDL 2.0 supports REST.

I would not say fell out of use, most enterprise-grade apis, old or new, will have one -- think bank/government/big corp. GraphQL is not there yet - as other commenters pointed out the tooling is not good enough outside JS world, security is complicated on the service side, and the protocol is just to young - the official release is two years ago, so it may start appearing just around now.