No, Samsung is not going anywhere anytime soon. There are other local players like Micromax, Spice and Karbonn. With AndroidOne initiative, these players will be able to produce less expensive but powerful Android phones pretty soon. The Indian smartphone market is wide and open with a lot of potential.
As i am seeing Samsung, most of there devices are same in looks, so its losing brand value as far as i see. Also samsung is not reinventing anything new in there devices.
Definitely Micromax, Spice and Karbonn will get some market once AndroidOne come in the mareket, but they are not still brands.
you are correct Indian smartphone is wide market and lot of potential will be there.