I must note that If a Linux phone is available an average consumer wouldn't switch to it from the duopoly(Android/iOS) due the limitations with app ecosystem but I feel that the Linux enthusiast market is large enough that manufacturing a Linux phone in India for the world could be profitable.

Besides few governments around the world have been open about reducing their dependency on the duoploy mobile ecosystem and so policy level incentives for Linux based smartphones could be something which could be workable with more manufacturers.