For me the more pressing question is would I want to be in the capsule that uses parachutes for landing or rocket engines. My unscientific guess that using parachutes for landing humans is safer - one engine failure of eight (?) engines and capsule is off-course and crew is gone.
I suspect it would be designed so that the lose of one engine wouldn't cause it to crash, just like the lose of one parachute cord shouldn't cause other vehicles to crash.
I'd also be surprised if they did anything to foreclose the use of a parachute. If NASA or somebody else wants to eat the weight of a parachute as a backup, I doubt SpaceX will say no.
