no. Jai White excels at physical roles in which he can use his martial arts to help carry the role. He's not a terrible actor, but he's not that good either.
GL requires very little physicality (not that you can be 5'5, 120, but you don't need to be 6'3, 225 either) and no martial arts.
@scarlet_spider03: I love Michael Jai White but I don't see him as John Stewart. If I could pick ANYONE for the role I'd pick Keith David. He is perfect. The only problem is he's maybe a little too old.
Now, Crispus Allen isn't the Specter I want to see on film but if they went with him, I think White would be great in that role.
White already gets alot of DC love though. He's already played the crime boss in TDK and Bronze Tiger on Arrow.