yes RIP MCD, but NO, he would not have made a great Apocalypse. There was barely any sensible reason for him to be King Pin in Daredevil, and he could barely portray a measly organised crime boss. Apocalypse is 5000 years old or more, and amongst the most intelligent and majestic of all beings in the Marvel U...
Michael Clark Duncan could have made a great Bishop (although of the wrong ethnicity) or even a great Erik Killmonger... but never Apocalypse. James Earl Jones' voice would make the perfect Apocalypse's. He's not really human looking anymore, so anyone could be the body - or even CG.