The remaining question is whether it is economic to do so
This has been settled long time ago.
Every repair is different but airlines are interested in repairs that happen most often - bends and nicks caused by service vehicles at airports. This is where they loose a lot of $$ every year. The repair techniques developed for such repairs in the composite world are multiple time faster than with the aluminium body and some small damages that require repairs on aluminium aircraft will require no repair at all on a 787.