One thing I hope for Season 7 is a new Wells, I HATE the "Every Wells is now just a voice in Nash's head" thing. I'm worried that, since the new multiverse is still unknown to the inhabitants of the main Arrowverse Earth, we'll just get more of Nash and his split personalities. I'm hoping some science thing splits him up or something, because Nash, while not bad by any means, is easily my least favorite recurring Wells. Wells in general is usually my favorite supporting character, so hopefully we get something solid for him this season.
But honestly, as long as Mirror Iris is gone by episode 2-3, I'll be happy with Season 7. That's all I really need at this point, for the entire Mirror World story to end. I feel like I wished on a Monkey's paw with that shit, wanting an actual Mirror Master for years, and it ending up as the second worst Flash storyline (after the crap with The Thinker aka all of Season 4).
As for The Flash getting renewed for Season 8, I hope it goes on as long as the actors are willing to be on the show. In my opinion The Flash is the only remaining good Arrowverse show, so when it ends it will really be the end of an era, and I'd like to delay that for as long as possible. Its nowhere near the heights of Season 1-3, which are genuinely great, but outside of Season 4 and the Mirror Master stuff The Flash is still a solid (f flawed) show. When its gone, the Arrowverse that I care about will be completely gone, so I hope it sticks around for awhile.
I'd honestly be fine with a run as long as Supernatural, I'd love for The Flash to be the last Arrowverse show standing. its already going to have outlived Supergirl and Black Lightning, which both started and will end during The Flash's run, I'd love to see it at least outlive Legends and Fake Batwoman.