I'm still a little fuzzy on how Barry would still have memories of having actually gone back and made the timeline change, and if not wouldn't the series in essence be starting over from scratch. Also, I think there would be little change to the world except what happened to Central City because it was largely due to Barry's presence as the Flash. Basically, I don't see the explosion happening at all with the change. It will be interesting to see how this all turns out and am avidly looking forward to the season.