I think ultimately he's going to get something like the Turner role from last year. That said he doesn't have huge splits, in fact to this point he's got modest reverse splits, so it's not crazy to hope for an everyday player.
I suspect despite being the most obvious 1 for 1 replacement he's not going to fill in for Austin coming out of camp though. It seems pretty clear the team is nervous about outfield depth, so I think they're going to take the opportunity to be able to hold onto both of Conforto/Carlson. And not really tied to Austin but on a similar note I'd be pretty shocked if they don't add McCormick to the 40 man roster and stash him at Iowa.