The 18z gfs, nam just makes Marco totally disappear.
Granted the wind shear is there. But as the center moves in a westerly direction so does the trough at 250. It retreats as the HP moves west too.
I just don't see Marco basically completely vanishing within the next 24-36 hours.
Hard to imagine a cat1 hurricane to remnant low with in 24-36 hours over ocean water that is particularly 90 degrees.