There isn't really any other place to use ribbon boards. They have been using the bottom of the first two ice boards as ribbon boards, I'm assuming they'll do the same thing with the next to. Same with the boards at the bottom of the SEZ.
I'll be honest, I always thought they's either use the concrete face of the club seating in WSC for the ribbon board. They could alternatively add it to the loge box level (one more up) as that line goes the entire length of WSC. That being said, they clearly didn't intend to do it since they never did it, and had a golden opportunity to do so.
FWIW I would have moved the names in the ring of honor on the east side to put the ribbon boards there as well, and find another local for those names, the aforementioned loge box level on WSC would be my choice.
If they had done that they would've had ribbon boards all at roughly the same level on the east side, west side, and now south side. You could have even added it to the bottom of that weird balcony on Vanier, and boom, practically 360 ribbon board.