For a trivial CRUD app, the dev can just re-use one they already wrote, no need to learn this layer you've created ... and for a complex CRUD app or something more complicated than that, you're going to need to write real code anyway, so who is the customer?
Why would I as a Python, JavaScript, or Ruby webdev learn your layer, which is at risk of disappearing in a bankruptcy? What will my investment of developer hours look like in 2 years on your platform, if it's still around?
Is it basically only useful for web stuff?