"Jupyter notebooks may replace the traditional research paper typically shared as a PDF..." - hardly a replacement as long as Jupyter notebooks are not self-sufficient files you can download and view offline everywhere. Even if you have up-to-date versions of Python and all the libraries installed you still have to run a server and open it in a browser which is a way more clumsy than just opening a PDF in Okular/Evince/AcrobatReader. I also doubt Jupyter notebooks are easy to view on mobile devices.