Megajournals have witnessed a decline because publication speed has with high acceptance rates. “Megajournal publishers clearly have yet to persuade many researchers that their approach adds significant value to the scholarly communications ecosystem,” says information scientist Stephen Pinfield from the University of Sheffield in the United Kingdom.
They witness decline in submissions because of newer journals with more flexible business modules are offered to researchers. A lot of these issues faced by the megajournals have also a lot to do with staffing issues as well. It seems newer and niche publishers are seeing most of the business.