That's a bit of a no-true-scotsman there. If the problem is just the markup of choice, we should see an alternative markup emerging any time now. If we see imperative-focused tools instead, maybe it's not just about the markup.
We do see alternative "markups", if you want to call them that, emerging that solve the generative issues - the two that come to mind are Dhall and CUE. They bring forth JSON to help them interoperate and be relevant in a world that predominately expects JSON/YAML, but they can also be read directly.