I definitely think they are steering towards John Stewart. Idk if i like the rumored Dwayne Johnson for the role, but he's a big name with tons of history w/ WB.
But, if they were to stick w/ Hal Jordan, WB has recently and more consistently started working w/ another big name actor who imo draws a larger audience and more star power. Tom Cruise. I know i might get flamed for this suggestion but while at 51 years of age. Tom Cruise is a proven actor. Known for his action movies, and the fact that he remains fit and almost if not always does his own stunts. He would also bring the more mature wit and charm as well as charisma that Reynolds simply couldn't deliver as Reynolds most always comes off as goofy or silly. And Cruise simply looks like the character.