The article mentions that the bill was first introduced in 2015. I wonder how many aquariums had started removing their whales and dolphins during that time.

Some quick searching shows that some aquariums have been doing this, including Marineland itself:

https://globalnews.ca/news/5238289/marineland-vancouver-aqua...

In this sense, passing the bill now might be less of an incentive to change and more prevention of a change back.