2) Matthew McConaughey
Though the rumour has cooled down now, back in 2015 Dallas Buyer’s Club actor Matthew McConaughey was allegedly being targeted by Marvel for Norman Osborn. It probably wasn’t actually true, but it does offer up a very strong candidate for the role.
Discounting Cooper’s version for reasons just stated, the current image of Norman Osborn to moviegoers is Willem Dafoe’s grinning mad scientist. Though he was brilliant, there is a lot of room for the character to be reinvented as a powerful and serious threat. McConaughey could easily deliver on that.
The actor previously confirmed that he had been approached for unknown roles by both Marvel and DC, but he had not taken them up on the offer. Maybe with a juicy part like Osborn he would be tempted enough to finally sign up for a superhero film?