Some ideas seem like no-brainers to me. After the events of Forever Evil, it only made sense that Lex Luthor would see himself as a hero. After all with the Justice League out of commission it was Lex, along with other villains, who saved the world from the invasion of the Crime Syndicate. The very basic question is what is next for one Lex Luthor?
Why the Justice League of course. Seeing himself as the worlds greatest hero of course he would feel he deserved a place among the greatest hero team around. The ideas is ripe with possibilities.
How long can Lex play the hero?
How will Batman, Superman and the other heroes react to his prescence?
Is this all part of some long game, some new nefarious plot to unleash his villainy on the world?
The key to however this story plays out is Lex himself. He is one of the most brilliant men in the entire DC universe, even smarter than Batman or Mr. Terrific. The problem is he knows it. His overwhelming ego is often his own downfall. Lex finds it hard to believe that anyone could possibly be his peer, his equal.
In my eyes that is the source of his disdain for Superman. Lex believes that he should have been the hero, everyone should have been looking up to him. Instead they applaud this alien with fantastic powers. How much of his desire to be a member of the Justice League comes from a desire to show that he is better than Superman? How better to prove that than to take his place?
Lex is his own worst enemy, always has been. In time his true nature always reveals itself. It will not be good enough to be a hero among the Justice League, in time he will need them to do things his way. After all his way is surely the best way. That is when things begin to unravel.
That is when things should get good.
In Forever Evil he created his own team to fight the Crime Syndicate. I would expect him to do the same as things with the Justice League deteriorate. Lex would of course want to surround himself with those he feels most comfortable. He understand villains motivations, I believe the heroes motivations are slightly foreign to him.
In the past we have seen Luthor lead the Secret Society of Super-Villains, the Injustice League and other villain teams with the names often used interchangeably. In my world I would see this teams as there own unique entities. The Secret Society and the Injustice League should have there own defined rosters. With the Secret Society composed of villains more on the edges of the world, while the Injustice League would be decidedly more mainstream.
For my purposes Lex would create the most important villain organization. The Legion of Doom. Pulling from the old Super Friends show. Give them that Darth Vader-like skull base and a small roster of powerful villains. I easily see Lex surrounding himself with Grodd, Black Manta, Felix Faust, Cheetah, the Riddler (the Joker would be to hard to control)and his own creation Bizarro to round out the group. More brains than power but plenty of power.
Hero groups do need great villain groups and the Legion of Doom does fit the bill nicely. It also returns Lex Luthor to where he belongs: at the top of the villain hierarchy.