At this point I think any hope of this season ending up in the world series relys on Yelich finishing the year in the lineup and hitting well. Without his bat their screwed now that the trade deadline has passed.
I'm not sure how long you can keep going with a guy hitting 0.170 in your lineup for the better part of 2 months.
He's going to need to spend some time in the off-season with a hitting guru to iron out his mechanics and probably play winter ball.