Ivo wouldnt have killed Sara either way so basically slade wouldn't be mad Olicity wouldn't have be together,Oliver night not have met the team,Taiana might be alive because her and Oliver Queen wouldnt have met because he wouldnt have work for argus because he wouldve had to keep it a secret from shado if he did, He might not have escaped Lian Yu or met Anatoly, and his mom wouldn't have died(well she's alive now)The world would have ended because hestopped undertaking and he was Spectre in crisis, Ra's A Ghul may still be alive, and William and Mia might have not existed
All of this is possible but we can't be sure of anything🤷🏻♀️🤷🏻♀️🤷🏻♀️