Lets face the facts. Journeys will come to an end before the Gen9-animé series kicks off. Whether or not it will be a continuation or not - the storylines from this series will have concluded early November at the latest. This means the current PWC-arc and Goh's Project Mew whatever will need to resolve in a set amount of episodes.
Meaning we only have June, July, August, September and October left. 5 months to wrap this trainwreck up. That's maybe 25 episodes left at best? If Ash is going to have 3 Master8 fights, then I'm assuming at least 3 for Leon, 2 for Cynthia, 1 Haxorus gets lost at the League and 1/2 for whoever gets the unlucky quarterfinal match-up. That's 18 episodes left for ProjectMew, whatever they want for Koharu (don't remember the spelling for the English name).
Meaning they might have room for an extra 4episode arc, but it's pretty darn clear that Raihan is going down here..