Creating a legacy compatibility layer, so that you can rewrite each component or area piece by piece is definitely the way to go. That's how I've been reworkin

Creating a legacy compatibility layer, so that you can rewrite each component or area piece by piece is definitely the way to go. That's how I've been reworking Appleseed into a component-based MVC, and it's worked really well. People still can use the legacy code, they don't have to wait in the dark while things get rewritten.