I honestly don't see how we score significant runs next year if Rendon walks. Rizzo is terrible at under-the-radar pickups, he's good at some trades or big free agent signings. Allocating Rendon's money to stopgaps at 3B, 2B, 1B and the bullpen is a terrifying thought.
Without Rendon next year's roster has 1 player you can pencil in for an OPS over .800.