Of course there is always a chance. But realistically, a team like the Jays with multiple holes has essentially a 1/20 = 5% chance of lucking into the WC.
Unless they open the vault and sign multiple free agents, Alex Cobb and others. Quite unlikely.
The question is, keep JD, hope for luck, and lose him for nothing at end of 2018, or trade him now for Reyes+ to load up for the Vladdy era?