Yes, definitely at least a million or two migrants can move from Bengaluru to Mangaluru.
Unlike some cities Mangalore is cosmopolitan and welcoming of settlers. I know Mangaloreans who are Gujarati, Rajasthani, Kannada hinterland, Malayali , Tamilian, Marathi, Telugu and even foreigners who are natives here and equally one of us. Hope it always remain so.