I'm not going to give you the thumbs down, but I will say that I respectfully disagree with both things you said.
I actually do expect Green to be back next year, even IF we win it. He absolutely could get more money elsewhere, but we can still offer enough to keep him satisfied. I genuinely believe he loves it here. He gets to compete night in and night out for a team that's chasing a title, and he honestly looks happier/more smooth on the court than I've seen in years.
Cedi can do many of the things he can do, I do agree with that - but their roles aren't exactly the same. Cedi is our defensive specialist that we can even comfortably switch onto PG's at times (see him vs. Kyrie and occasionally vs. Westbrook last night). Cedi will also continue to start and not be relied upon too much offensively yet, while Jeff can still come off the bench next year and have more offensive freedom --- which he's done well with thus far.
As long as he doesn't wish to chase much more money next year, I think he undeniably has a role carved out going forward for at least the next 1-2 seasons. I think he, LeBron, and many others see how special this team can be not just this season but going forward. We've only scratched the tip of the iceberg when it comes to the potential of our new squad.