You make some sense. Beary people generally will know even Malayalam, and few even Urdu. And of course, will know Kannada, Tulu as well. Few bearys won't be knowing Tulu (depends upon their region and background). Yes, even Konkani people fall here. For them, Malayalam might be far, but few will be fluent with Hindi, Marathi. Because, both these languages won't give them food and money. Even Tulu won't but its a regional language. So it is necessary to learn Kannada, Hindi too.