India have already lost the series by losing two consecutive matches. If they make one more mistake it will be whitewash. Which could be a dark chapter for India. So I think it is logical that they should be reorganize around the upcoming match. Spin ball will be effective. The way Shakib Al Hasan is getting wickets can be something like that even if India brings a spinner in the team. But there is no alternative for India to win the next match.
Bangladesh has secured victory in the previous two matches against India. This victory will be remembered in the history of cricket world. Tomorrow is the last ODI in Bangladesh and India's Bangladesh will want to white-wash India. But I think India will bounce back tomorrow and try their best to avoid a whitewash.
I don't know whether the Indians will be a lot worried about getting whitewashed. They came to Bangladesh without much preparations and refused to play any warmup matches. And in the first match itself, there was no urgency from the part of the Indian batsmen despite losing wickets regularly. They were not serious about their opponents and thought that it will be a cakewalk. And they hardly learnt any lessons from the first match. Even in the second match they showed no seriousness and let the match drift away from their control.
Definitely it will be biggest concern for Indian team to avoid whitewash and they will do there best to win the last match. Indian board is not replacing Kohli with some new talent. Its best for Indian cricket to get some new talent. Moreover relying only on Kumar bowling is also hurting Indian cricket.