I'm a big fan of the layer based compositing and layer based editing After Effects currently has. That being said I'm well aware of the demand for node based workflows from other professionals in my field who use software like Davinci Resolve/Fusion/Nuke. From what I gather I have heard the excuse that AE is too old and integating such feature's would be too difficult.
I'm no expert on software development but my suggestion would be to devide After Effects in two. Upon opening After Effects you are greeted with a choice of what kind of project you would like to make. A "Layer Based" or "Node Based" project. Selecting Layer Based will take you to the traditional layout. Selecting Node Based will launch you into a new UI that visually more akin to something like Nuke. Over time Adobe can work on ways to integrate the two halves together but by doing this they can cater to professionals or new enthusiasts who want to try out other methods of compositing.