There is a modern day genetic technology called CRISPR/Cas-9 that could virtually eliminate any bacteria/virus that threatens future human life like MRSA Superbug. There is more concern about of Artificial General Intelligence (AGI) exponentially evolving itself into a Super Intelligence threatening the future of the Homosapien sapien.
Thus, the possibility of sub-nano/ femto-robotics transmuting humans into hyper infectious Zombie Cyborgs controlled by a Supreme Artilect is more probable in 300 years. Google: The Artilect War.
However, I can see some plot parallels between your game concept and ours Open-World Action RPG Hybrid set in Apocalyptic World shattered by Dimensional Space/Time Rifts. We’ve initiated development a few months back building systems that will support game development beyond one product. How far along is your team in the development process? Perhaps we could collaborate. Lets discuss further over here.