We've been looking about making this change for some time.
It would be great to simplify the codebase by moving the code to one language.
My suggestion is to use Render-Engine (Disclosure I am the maintainer of Render Engine)
Pros
- Completely removes ruby from build
- Modern SSG built in Python
- Actively encourages developers to support an ecosystem created by a BPD member
Cons
- Not a popular web framework