With full understanding that I’m tempting fate with that title, I can see no reasonable path to a trade involving Kyle Schwarber. The most obvious obstacles are his position and historical performance, since it’s not exactly difficult to find a power-hitting corner outfielder whose glove is just okay at best. That means his value to the Cubs is greater than what they could hope to get back for him, particularly after his second-half adjustments.
Rather than rehash everything in detail, I’ll direct you to the link above in which Schwarber’s improvements are laid out more thoroughly.