The people that are saying it's unfair for Mahi to stay in the competition, is because they go by the contestant's dance and scores, rather than their popularity. So you must understand where they are coming from.
Therefore, if Mahi wins, she will not automatically become the best dancer, even though the goal of Jhalak is to reward the best dancer. At the end of the day, the people that deserved it based on their dance, will not win. This has been happening in all seasons, so there's nothing new about it. I wouldn't be surprised if Mahi wins. Congrats to her if she does. But the ultimate winners will still be the best dancers of the show, and nobody can change that! 😊