I think the purpose of the poem is to make the reader consider the impact of decisions made during life. My interpretation of what will happen as a result of the poet's decision to take the road less traveled isn't as important as that every reader finds his/her own meaning.
In answer to your question, however, I think the traveler would have been disappointed if the choice had been to take the more traveled path. In reading the poem, I think the traveler enjoys time to discover and experience on his/her own, without lots of company along the way. Therefore, I don't think the traveler would have enjoyed the trip as much if it had not been taken on "the road less traveled."
awsome answer Stolperia