Why Dinesh Karthik is ideal for India's number 4 slot

Additional wicket-keeping option

Dinesh Karthik would act as a back-up to Dhoni

Come 2019, Dhoni would be 38 and fitness might be an issue. Karthik could help the team by not only replacing Dhoni when he is injured but also easing the burden of keeping. Rahul is a fairly decent keeper, but a proper gloveman who can perform well with the bat would be a better backup option.

Dinesh Karthik also has a good track record in England where the next World Cup is scheduled to be held. Moreover, he has been in contention for almost a year now and surely deserves a place in the Indian team considering the struggles of the existing batsmen.