Outfield depth in that scenario imref wouldn't be that bad, IMO. Harper can fill in in CF if needed and I think Kendrick even played some LF? I wonder if we'd consider giving Turner some reps there again.
LF - Soto
CF - Robles
RF - Harper
You'd think that's your OF for at least a few years, assuming that Robles is at least MAT level of play. In case of injury, in 2019, you've got Stevenson who can fill in and it won't be difficult to find 4th outfielder types on minor league deals/waiver wires/short contracts. If 2 of our 3 outfielders get hurt then depth wouldn't really help us anyways and we'd be just trying to stay afloat with Turner/Rendon/Gomes/etc.