I'm going to use Drupal as my guinea pig when thinking about this because Marc has shown the most interest in trying to make this happen. The holy grail does seem to be creating a way to have PL live with a remote project. Right now it's very good for the development but falls short or probably requires a lot of work if used as part of maintenance.
In order to work well for Drupal I would assume we'd have to tackle the following three problems:
- Develop patterns in the native format (Twig)
- Store or export patterns so they match the destination format (theme structure)
- Sync the exported patterns with a remote system