Among South Dravidian languages Telugu and Kannada end their words with a vowel. However, Tamil and Malayalam lack it. Which is the proto-state?
If you consider English, until 14th century the ending -e was pronounced distinctly by the English. However, the later generations dropped it. But since spellings were standardized by that time, the written language still shows the words with -e ending. But it is clear that the old forms of languages generally tend to have vowel ending. Hence Kannada and Telugu have retained the older forms.
In the case of English, the time changed vowel ending. But in the case of Dravidian languages it is geography. Though it should be noted here that North Karnataka is more at ease with vowel ending than South Karnataka.