One option for streaming services with thinner content libraries is just to subscribe for a month or two every so often and binge watch their limited good content. The first month is usually free.

> do people really think "I'd like to see a Disney movie tonight" or do they just want to see a particular movie or genre?

As sibling comment mentions, kids of a certain age do want to watch Disney all day. Disney's biggest streaming lure should be the live sports from ESPN which also has lots of loyal viewers. I could envision paying $19/month to both Disney and Netflix in 2020 assuming Netflix's content continues to ramp.