It is fun to say that the Cubs are only 3 games out of a Wild Card spot, and they can use that to sell the fans and try to drive ticket sales, but their playoff possibilities remain dire.
I'm glad they are playing better baseball, but they still need to pass 4 teams to get into playoff position. The Diamondbacks and Padres are both 7 games up, a huge deficit to make up over 43 games. That leaves the 4 required teams as the Giants, Cardinals, Mets, and Braves. Only one of those teams really scares me, but it is the Braves with a 3 game head start.
I think the Cubs are going to need to play well over a 60% winning percentage for the rest of the year to have a fighting chance. If they can go 26-17 or better, maybe there's a chance the Braves play .500 baseball the rest of the year and the Cubs can sneak into the last playoff spot (assuming that none of the other 3 teams also win at a similar pace to the Cubs), but there is very little room for error.