While I'm certainly not a big fan of trying to make a big deal with Miami involving Stanton and other pieces, I will admit a swap involving Yelich would at least pique my interest a bit if I were Coppy. Having 2/3 of our outfield locked up through 2022 with hitters/defenders like Ender and Christian at their ages and with that kind of cost-certainty sure is awfully intriguing. To make a move for him, you'd obviously have to be sure you could move one of Markakis or Kemp, but assuming you could do that, I'd love the upside there. Let's assume you could get an interesting prospective pen piece or two for Markakis, would you be willing to package say Dustin Peterson, Ruiz, Sims, and maybe Touki for Yelich and take a shot at competing next season?
Go get Moustakas this winter and you'd have arguably as deep a lineup as anyone in the NL with Ender, Yelich, Freeman, Kemp, Moustakas, Flowers, Albies, and Swanson. Get what you can (obviously not much at this point) for Big Sexy and Dickey, and use that money to add one veteran rotation arm for 2018 - Lance Lynn, Alex Cobb, or possibly extend Garcia and see just how far you can get. If Folty really has turned the corner, Julio can get his act back together, Lynn/Cobb/Garcia could be a capable #3, and Newcomb can at least be as good as a developing Folty has been as a #4 you could be looking at serious help coming in the second half of 2018 in the forms of Weigel Allard/Soroka.
Acuna replaces Kemp when he's ready without being rushed, and Moustakas becomes trade bait if/when Demeritte, Riley or Maitan are ready to step in.
(Left out Sims in original post.)