So far as I know, the way we've eliminated sexual bias in formal writing is to make 'she' just as acceptable as 'him,' provided that it is used consistently and in the same way that we use 'him' to stand for anyone. For example, if I wanted to I could write a whole article that used 'she' and 'her' instead of 'he' and 'his' or 'him.' Consistency is what matters.
S/he/it is just cumbersome and ugly, and bastardizes English. Leave this one alone.