I don't think you understand how much power Disney has. They own all popular superhero movies. Nearly all well-known children's movies are owned by them. Star Wars now is their IP. Netflix has what? House of Cards (which was discontinued)? 30 other TV shows that range from okay to "people talk about it once or twice to their friends"? 5 movies that are produced slightly higher than a TV show with mostly mediocre ratings?

Families with young children will subscribe to Disney's service almost guaranteed, and since a few years ago Disney has enough content for the parents, too. Why pay for two or three streaming services? Maybe Disney is enough. Disney's portfolio will also not shrink like Netflix' does often due to expiring licensing contracts but steadily extend over time.

Netflix might grow like crazy currently but they are massively in debt due to their movie making and their startup-like growth will eventually stop. As a Netflix subscriber I wish them the very best but I really, really hope they are aware of Disney and will be able to keep up.