We all want a strong foundation and will continue to work to create one. In parallel, many of us like building and sharing things, and given that most things in Kubernetes are just abstractions, the things we are building today will continue to work tomorrow, even if the "secrets" backend is reimplemented on top of something like Vault.
I'm hopeful people find things like konfd useful, even if you only use configmaps and avoid secrets entirely -- a use case supported by konfd.