As I'm working on a paper RPG, I am watching Steins;Gate and playing it for the third time, and I am almost convinced there were way more iterations between alpha & beta than we can imagine.
Attractor fields are supposed to counterbalance the chaos theory, and make little changes have little consequences, and the main events are remaining to occur.
But the convergence point of July 2010 made something unprecedented in the History of the universe (presumably): it made the time itself oscillating between three (or more?) stable worldlines from two different attractor fields.
At first, a beta worldline, where Nakabashi killed Kurisu and start WW3. Then, trying to change the past to prevent Nakabashi from stealing the paper to Kurisu Makise, Suzuha made the alpha worldline: D-mail are sent, SERN captures Kurisu Makise and Rintaro Okabe, the 300 dominate the world. Suzuha came back to 2010 and made the Nakabashi conference cancelled. Thus creating the first stable alpha worldline (alpha is generating alpha), but in this worldline, Okarin & Daru figured out they needed the IBN 2010 to prevent the SERN from tracking them, and they added this to Suzuha's mission.
Suzuha came back one again, gave the IBN to the FGL, and this led to come back to the beta worldline. Erasing all progresses, those three worldlines are doomed to repeat.
And it did repeat all over again. What would have changed that? The universe was stucked, oscilating between three positions. In those cases, an instable equilibrium could be found, and this is Steins;Gate. In order to reach this equilibrium, one has to developp Reading Steiner. Okabe did, maybe because he was each time chosen by Suzuha to help him save Kurisu, and stabbed the woman he loved over and over again. This trauma, associated with regular time travel created the Reading Steiner effect.
Another theory that I have about this Reading Steiner is the weird video Rintaro received. Maybe lost in this cosmic loop, they were piling up more and more research on the subject, and founded a way to trigger Reading Steiner (or more likely to enhance the natural ability each human have) in Rintaro. This ability made him able to break the loop, at the price of a high suffering.