He is a contender for all time World ODI XI. I can only think of Gilly as the other contender for WK-batsman. But Gilly was an opener and there are many others who can do that job as well.
Dont be silly now. Gilchrist is an absolute LOCK for an AT ODI X1. Marvellous opening batsmen, and a solid keeper. Dhoni is not about to replace AG in anyone's mind.
MSD is a class finisher, a cool head. Gilchrist was a destroyer of attacks from ball 1.
Infact, I will postulate that Gilchrist is a LOCK for an alltime X1 in either format.