The Cubs will keep playing hard. It's not just to get a wild card. They desperately need home-field advantage in the wild card game; the spread between their performance at Wrigley and on the road is truly remarkable.
If the Cubs win today,, then the Phillies are pretty much goners; they would trail by 4.5 with 14 to go (13 for the Cubs). And the Phillies -- also a poor road team --must go on an 11-game trip (Atlanta, Cleveland, Washington) before returning home to face the Marlins, who have given the Phillies fits all year.
Did you notice that Bryce Harper was ejected from today's Phillies game for arguing balls and strikes? This is the second time he's been ejected like this. The first time, Jake Arrieta publicly criticized him ("we need him in right field") The season is over for Arrieta, and I wonder if anyone will say anything now.