I think if he goes out from the team, it will be difficult for him to come back. Shreyas Iyer is knocking the selectors door very hard for that slot. We have so many openers actually.
Shreyas Iyer
Unmukt Chand
Manish Pandey
Ajinkya Rahane (atleast in T20)
And selectors might even consider Gambhir and Uthappa. It is highly unlikely, but possibiity.
So unless all those young lads fail to score or if Shikhar scores heavily in domestic cricket, it will be difficult for him to make a comeback once he is dropped. I am sure he is aware of this. Let's hope he succeeds in WC. If he doesn't it will be a blow for us.