That could have worked, though I still like S3 and Aussie Ra's, that's where I think it should have ended - S4 really suffers from having to contrive getting the characters back together.
Meanwhile, I'm on the end run of Flash S2.
Does feel like they're milking it now - Zoom suddenly manifests a new ability while going black-eyed? Er, yeah, I'm going with 'Writers Pulled That One Out Of Their Backside' because that's what it felt like. Hell, he's defeated, Baz? You know you're allowed to kill a supervillain serial killer, right? Of course he doesn't.
Pity, as the episodes leading up to this and the revelation of Jay being Zoom worked well.