Citroen want Hybrid technology. However if Ogier leaves and they can't attract a top championship challenging driver (or one with huge potential to be), I reckon they'll pull the plug. Lappi was meant to be that but he's started poorly and who knows if he'll turn it around. If he can get into position to lead the team when Ogier goes that'll be great.
The only way I don't see Ogier leaving is if he wins the next two titles and wants to go for 9/10 world titles. He's certainly capable but has been hinting about retirement for years now, despite having plenty of years left in the tank