Nike isn't going to drop a player because they came out as gay. That would backfireIt could hurt endorsements and other opportunities dealing with the public. Look at the people insulting him in this thread, not for the alleged assult, just for being gay.
If you are producing on the field or the court. Being gay won't hurt your opportunities at all. Might actually grant him more opportunities honestly.
but yeah, he would have to deal with bullies and heckling nonstop.