[SmG Battlefire]

My view is that there are too many claiming to be 'The Flash' who are descendants of the original so.....
With the last statement you're implying that there is a Justice League.
However, without Batman, no Justice League, hence no projects against them. Therefore, Amanda not necessary. Boom.
Wonder Woman, ehh.... Different, sure. She was a key member of the team, but I'm not sure if she soloed anything major. Can't remember.

Without the Justice League Lex would still go for world domination. And without the Justice League he would have succeeded.