As a professional, I think about the evolution of writing. And, of course, I ask myself all kind of questions to which I try to find a solution. They are not necessarily the best but having a vision of the future allow you to anticipate.
Here are three issues we should think about :
As an author we can facilitate accessibility by offering files whose content is structured through the use of style sheets. Publishers will then be able to continue the accessibility process.
Regarding the recycling of paper, there are labels that are more compliant than others, similarly vegetable inks are possible. That said, print on demand seems an alternative.
Finally, DRM does not seem to me to promote the dissemination of a book for the public. Similarly, the multiplicity of formats according to a particular type of equipment restricts reading.