Disney's got a decent library, but the value lies mostly in animation, Marvel and Star Wars. What will keep Disney+ from getting forgotten in the streaming wars are these 3 things:
1.) It's entry price is $6.99 or $12.99 with the bundle, which is less than HBO Max and Netflix cost.
2.) The service works amazing as a baby-sitter as parents know that the content never goes over the PG-13/TV-14 threshold.
3.) As weak as Disney+'s Originals are looking right now, they have quite a few heavy-hitters with all of their MCU Series, more Star Wars Series (incl. The Mandalorian Season 2), The Right Stuff also I think has a chance to be a pretty good non-Disney IP scripted show. At some point, their originals are either going to be what carries the service or sinks it depending on how they are received.