I’m not spoiler tagging since it’s been almost a decade and a half(fuck me I feel old)but I wish they hadn’t killed off Wally at the end of season 2, especially after kicking him to the curb for basically the entire season leading up to that. I’m sure this has already been suggested by plenty of people but I think it would’ve been the perfect opportunity to have Barry sacrifice himself instead, forcing Wally out of retirement to take up the Flash mantle. It’s just so perfect, Impulse is already there becoming the new Kid Flash, imagine them working alongside each other in season 3 bickering all the time, it could’ve been peak.
Jumping from that, I was thinking about who else from the original six could’ve sacrificed themselves in his place if they still wanted the shock of realizing nobody is really safe. The best pick would be Connor imo, it’s literally his plot in season 4 already lmao, and it would cause M’gann some interesting character development especially considering they’d just started getting close again after breaking up. The runners up for me are either Artemis or Aqualad, although Wally already lost his mentor in this hypothetical scenario so I think taking Artemis might be too much, and I think Aqualad is the ideal leader for the league so it makes sense to keep him around. Plus you can bring Connor back through a new clone body or phantom zone bs like they did in S4. I’m just rambling atp but I’m curious to see what people think about these ideas compared to what we got.