It's not even a debate for me. He will, and should absolutely play.
Aside from the fact he's our only left-back, leaving him out would send a terrible message to Klu Klux Klanfield.
However, the decision should be left entirely up to Evra, and it be made abundantly clear to him that we will respect whatever he decides - but knowing Evra, and his unwillingness to walk away from a battle...the United captain backing away from a clash at Anfield be HE was racially abused. No chance.