Let's get one thing out of the way first: the Cubs won the 2016 World Series. I bring that up for 2 reasons. First, that's awesome and I want to bring it up at every opportunity. The other reason is that it buys you a significant amount of runway to do whatever you want for the near future.
I'm not exactly sure why, but the Cubs are not good this year. At their current pace, they are an 83-win team, and they haven't given any indication that they are going to hit above their weight from July forward.