I'm not entirely sure I follow your point. Do you have a problem with trackless rides or just screen dependency? Screens and projections have been more and more a part of the experience lately regardless of ride type. I don't think any of the rides mentioned would be any more or less screen-dependent if they were omnimovers, for instance.
Poppins in particular, though, would be an opportunity to really take advantage of what trackless rides do best since the movies have plenty of song and dance numbers. Some of the most magical parts of Enchanted Tale of Beauty and the Beast and MMRR are Be Our Guest, the ballroom scene, and the conga line, in large part because of how they simulate dancing through free movement. Being part of the action in Chim Chim Cheree, Super-cali-fragil-istic, Trip a Little Light Fantastic, or A Cover Is Not the Book would be excellent.
As for screens, an attraction based on the Poppins films also has a great opportunity to make sensible use of projections and screens by transporting both you and realistic animatronics directly into animated scenes based on the sequences from the pavement artist and the Royal Doulton Music Hall.