Everyone here is imagining all the technical ways to replace publishers. That's quite feasible as you and others point out. I think there is also real work needed to solve social (people) problems, for example:
- explain to the stakeholders by preparing various text and other media about how your format/venue/website is different and better, and convince them that this solves a real problem they should care about
- solicit requirements from universities, funding agencies, various governments, about archiving and metadata requirements. Consider security, accessibility, long-term preservation, financial model, etc.
- respond to the questions and pushback from numerous stakeholders about problems (real or not) about your proposed solution, debate them in a polite and professional way in semi-public forums, converge on a solution that's acceptable (or at least not overly repulsive) to the key stakeholders. Deal with any PR backlash, response from existing publishers, etc.
- inform authors, potential authors, readers, journalists, universities administrators, students, etc. that there is a new publishing format/venue/website and that it is well managed and has a plan to be around for a long time
- coordinate and schedule a team of people to work on this with you, to figure out policies (author plagiarism, recruiting editors if needed, dealing with potential lawsuits, bad actors, copyright and IP issues, etc.)