There are a number of interesting potential PhD projects in this area:
Philosophy of language/metaphysics:
- Counterfactuals in a chancy world.
- Indeterminate conditionals.
- Learning about the non-actual: counterfactual epistemology.
- Conditionals and practical reasoning.
- Updating beliefs under conditional constraints.
- Counterfactual supposition: its nature and significance.
Please contact me at email@example.com to discuss your ideas—on these or other topics in the area!