Like there have been audio (layman) books.
I hope never...
(no diagrams, garbled equations, no tabular representations of data, , lack of flexibility, can't highlight things, half an hour for citations etcetera, etcetera...)
However if you want there are plenty of softwares which can read pdfs and epubs aloud...I generally use them when my focus is wandering that way both my eyes and ears get the same data input.
Separate names with a comma.