What did Soler do us for last year? I like his potential but he didn't contribute a ton in 2015 so the Cubs really aren't losing anything if in fact he's the trade bait (his fWar was .1 I believe). I suspect Theo would get rid of Baez before Soler so perhaps it's a moot conversation. That being said, Cubs have added Heyward and Zobrist who will bat in front of Rizzo, Bryant, and Schwarber. That should give you a massive boner.
If the Cubs then throw out Arrieta, Lester, Carrasco, Lackey... along with our much improved bullpen, not sure how anyone can pick against the Cubs.