"Down the road" is a commonly-used phrase that refers to a future event or circumstance that will happen at some point in time. There are many different synonyms that convey a similar idea, such as "in the future," "eventually," "in due time," "sometime later," "in the long run," and "down the line." All of these phrases suggest that something may happen at a later time, perhaps after certain conditions have been met or certain goals have been achieved. Whatever synonym you choose to use, remember that the idea is to convey the sense of a future occurrence that is expected to happen at some point.