Hi,
I know that a lot of people won't believe what I will say but in opinion, George Clooney is still the best option as Bruce Wayne/Batman. I know what you're thinking right now; Batman & Robin was the worst batman movie ever and you're right. What I'm saying is that Clooney is a great actor but he just played in a movie wrongly directed. I'm pretty sure that with a great director, Clooney will give an excellent performance as Bruce Wayne/Batman.
Some actors are perfect for a superhero role like Robert Downey Jr; he's the perfect actor who could play Ironman. He has exactly the same shape than in the comics. About Clooney, just look at him in real life; he's rich, playboy, charismatic, a great actor who can easily play comedy than drama. I'm sure that with more muscles, he will be the perfect fit. Ok he maybe a little bit older than the other actor who played Batman but maybe it's time to make a movie with an older Batman. I mean we all know his story (parent's murder, training...). Maybe it will be better to show him as an experimented Batman, expert in detective stuff and stealth.
In conclusion, taking Clooney for the reboot would make a excellent sequel for Batman & Robin movie. Same actor but different (better) director. What about Robin and Batgirl? Robin became Nightwing and Batgirl as Oracle.
You may like or dislike my post but as I said, this is my own opinion and I really hope that it will be seriously considered.
Have a pleasant day!