Just saw
this in the LA Times a few minutes ago - they're increasing the size of the lot by about 50%.
More space for cabs, Lyft moving into new space, Uber taking over old Lyft space.
I'm not sure it's a space in the lot problem so much as a limited I/O for the cars - one lane full of buses can bring people into the lot a lot faster than one lane of cars can get them out. Expanding the lot gives you a little bit more buffer for the matching, but if the output road can't match the peak capacity it will still overflow the input unless the peaks are very short.