1) whenever we get a final arc (I'll believe the next one is it when it happens, they've changed their mind so much on stuff like this) that it focuses on the existing cast and giving them satisfying ends to their stories rather than introducing a whole new group right at the end.
2) The end isn't the end. We've spent so much time with this world and these characters, would kinda suck for it to just be it. Like I don't need another grand 20+ game storyline. Let's just get some fun one offs once in a while that check in one everybody. Go on an adventure with Estelle and Joshua, solve a case with the SSS, etc.