If you think about it, the CBBR expansion was started only a few months ago. This could go up relatively quickly.
So interesting note, Universal/Loews sells their rooms in lengths-of-stay blocks. They reserve a small percentage of rooms for stays of 1 night, a bigger percentage for 2 night stays, and so on. I forget the exact circumstance where I needed to change reservation nights/number of nights and the representative told me that they had no more 1 night stays available for the night I wanted it, but I could extend to a 2 night stay (or longer) for either the night before or after the one I wanted.