Hey, I love Clemente's heart, but if he doesn't have his # retired, it won't be because of racism.
Clemente was second-team All-Conference (and 4th-team All-American according to Fox Sports). Everyone in the rafters now was an All-American/multiple-times first team All-Conference. A better comparison might be Steven Henson, who was first-team All-Conference, white, the starting PG for an Elite 8 team, full of "heart" -- and is not in the rafters.
I definitely wouldn't count on it happening.