Translation on one hand and interpretation on the other are two completely different processes that require different skill sets. However, that does not mean they are mutually exclusive. Most of us will eventually choose between one or the other, but I know several skilled translators who also interpret (mostly consecutively). As long as you enjoy both there is nothing that should stop you from doing it. Especially as a freelancer, the more skills you have the more opportunities for job offers. And if you are working as an in-house language expert at a company you could translate documentation or software and also be called in to interpret for business negotiations.