The size of Disney's catalogue may be underestimated by some. Having instant access to all their movies[1] and television shows[2] has quite a bit of value, and would consist of hundreds upon hundreds of blu-rays. I am not one who would sign up, but certainly if I had children I would much rather have streaming access to all of this than stacks of discs.
I am assuming a catalog "filled" with live action Disney films would mostly have those one-off concept movies they created for their channel than pages upon pages of movies standing peer to Pirates of the Carribean.
Still interesting enough to kids but let's not pretend like it's not padding; those movies were often very formulaic, "relatable kid with a weird life or circumstances goes on a journey" - not really worth the price tag for a subscription.
[1]https://en.wikipedia.org/wiki/List_of_Walt_Disney_Pictures_f... [2] https://en.wikipedia.org/wiki/List_of_Disney_television_seri...