It is too far a stretch, murdering the poor subject:
PDFs are the best format available for long-term information, such as research papers. They have the advantages of digital data: Searchable, copy-able, transmittable, and data is extractable. They are also an open format, don't rely on a central service to be available, and they preserve presentation across platforms. They have metadata, and are annotatable and reviewable. And the PDF format is the best for long-term preservation, carefully designed to be readable in 50 years - partly because they preserve presentation across platforms - and that includes the metadata, annotations, and reviews.
PDFs are like paper in that they will look the same 50 years from now as they do today, unlike (almost?) any other digital format.
Yes, I wish they were a bit more dynamic in layout, and that the text was more cleanly extracted.