It certainly helps. But look at Splash Mountain, Song of the South is a film that not many people have seen. I think it comes down to storytelling and how an IP is implemented into a lands setting. I think it also needs to not rely purely on having to have seen the film or tv show it's based on, because some people may not have. So to expand the story further just enhances the experience.
I'd love Indy to get His own land. I think it would be fairly hard to do, as he's a bit of a globe trotter. So it would have to be set in one specific area. Hopefully the new film will create a new audience and an appreciation for the previous films. The fact that they (and the Tv show) aren't available on Disney+ is disappointing