If they stop screwing Raikkonen around, they will retain him again for 2019.
If Grosjean doesn't stop wrecking himself every other race, they will put pressure on Haas to place Leclerc there instead.
Ferrari will not put a young driver in their factory team until they deem him/her ready and despite his talent, Leclerc isn't. He will drive for Ferrari one day, but that day is still at least a couple of years off. Just as Bianchi was supposed to. Poor guy had to suffer through a few years with Marussia/Manor until he died.
For comparison, how many years did Bottas do at Williams before being called to the factory team? 2 or 3? Same with Ocon now. RedBull doesn't count, all they do is screw their own drivers around day in and day out. Hartley won't last until the end of the season, all the others before him were sacked for reasons that would have had Verstappen banned from racing if they gave them all the same treatment. What else is left? McLaren? They tried Perez and he sucked so much that they kicked him out. Magnussen? Same thing. Vandoorne? He's there just because Button decided to retire and with the Honda shitshow going on at the time they couldn't sign anyone else.
It's the same reason why Alesi Jr is still "stuck" in GP3 and Schumacher Jr is still "stuck" in F3. The former will most likely move to F2 next year. For the latter, they have him still racing for Prema (which is backed directly by Ferrari) despite him not being officially part of the FDA. Which team would allow a non-factory driver driving for the factory-backed team unless they have plans and contracts already in place? That expensive seat could've gone to one of the other FDA drivers, but they retained somebody that is outside of it.
These things take time. Verstappen's example is irrelevant aswell, or perhaps it's relevant, but for the wrong reasons. Because it shows that such a talent is going to waste with how immature his race craft and attitude are.
What they need at Ferrari right now is somebody that can bring the car in the top3, and that somebody is still Raikkonen. He's down in the standings, but none of those results were his fault. Either they screwed his strategy, or they screwed his pitstops, or they screwed his car. Everything that often resulted in DNFs.
People wishing for him to get sacked just so that another one that has yet to prove his real potential can have a go, are just delusional.
tl;dr
No, Leclerc should stay as far away from Ferrari as possible for the time being. At the risk of wasting his prime years, he's still not Ferrari material. Ferrari never hire young drivers for their main factory team. The last one was Massa, and still, not only he was much older than Leclerc when he first had his debut, but that happened after driving for Sauber for a couple of years.
