In my experience, I’m not sure that I could tie leadership directly to the problem of wheeled items parked in egress corridors.
However, it would certainly not be a stretch for a citation under The Joint Commission’s leadership standards if the process failure was pervasive (and yes, I realize that pervasive is not a particularly definitive descriptor, but as with all things Life Safety Code, it’s shades of gray).
The other practical application of this might be the subject of boarding patients in corridors when the ED overflows, which came up during our 3rd Annual Hospital Safety Center Symposium  this past May. George Mills from The Joint Commission has previously said he doesn’t want to see patients on gurneys parked in egress corridors during routine ED overcrowding. 
Even if you put aside the patient “storage” aspect, the likelihood of other items being in the corridor along with the patient is pretty substantial. While the Life Safety Code generally trumps everything, I can see instances where leadership might not exactly be on board with that.