Best known for: Playing Jackie Robinson in "42"
For him: Boseman garnered solid reviews for his turn as the baseball legend in Brian Helgeland's biopic, and the film itself made quite an impression with audiences, grossing over $80 million in box-office worldwide. As a bona fide up-and-comer, he'll no doubt be on Marvel's shortlist for any "Blade" reboot.
Against him: Boseman's film career is practically non-existent, and he's never done action before, much less carried a movie on his own. It might be too early in his career for Marvel to give him due consideration.