Eh, not really. Look at the way channels are packaged on Sling. A big difference is that Sling has no locals. Also, the picture quality isn't great. And typically, you use your own equipment with the Sling app, not a dedicated box with a full-featured traditional remote like the Hopper has. (Although Sling does offer its own simple Android TV device, the AirTV Mini, which they'll give you for free if you prepay two months. Otherwise it costs $80.) Basically, Sling is positioned as an inferior, but lower cost, alternative to Dish. It's not a direct replacement for it, the way that DirecTV Stream is for DirecTV satellite.
But I see your point: Sling is a streaming cable TV service from Dish. So if Dish did what I'm proposing and began offering their full channel packages, essentially the same full-featured, full-price service they have now on satellite, but just over streaming, we might see them just dissolve the Sling brand. Maybe Sling's skinny channel packages, or something like them, would become alternate cheaper options for Dish subscribers, whether they get service via satellite or streaming.