The other argument is modifying the text. I don't think dumps of data running around like that of StackOverFlow doesn't help much. Many sites have got heat for modifying the user comments or reviews in the past. The average person who is using a site is not going to go through the reviews and the dumps of data and see whether anything has been modified or not.
StackOverflow makes money by storing the questions and answers. Thats the incentive mechanism. Also none of the users gets a portion of the money that they helped them to make. I am not sure whether this is the greatest example. One can easily write a smart contract that will facilitate the transfer of money from writers to reviewers without the need of any central server. The amount of money the reviewer gets would be a function of their reputation. So it would be in the best interest of the reviewer to produce high quality work and high quality reviews. A far as the storage is concerned one can make use of Ethereum or a general purpose blockchain for building this. You would have to pay for the storage(reviews, ratings etc) only once and the nodes in the network would make sure that its their for ever. The research papers can be stored in IPFS due to their large size. The files can be seeded by anyone. If the research paper is popular it would be always available. If it is not popular the author or the university can still seed it as its in their best interest. I don't think it matters much where the PDF file is stored. It can be in a central server run by University as well. So this is not a big issue.
Does that makes any sense? Feel free to correct me as well :)