The best use I can imagine for this is as a progressive tool to learn traditional sheet music. You start with this (simple stuff, maybe even add the finger-numbers onto the dots so one knows which finger hits which key) and make it harder step by step. Introduce pedaling, remove the numbers on the dots or replace them with their note (first by letter, later by graphical representations on traditional sheets), before you gradually transform it into traditional sheet music. Last step would probably the switch from horizontal to vertical but at this point you will have the notes down and it should make it easier to transfer from notes to keys.