This makes it seem like it was some sort of 50/50 split, but in reality it was more like 99/1. A tiny group split off to do their own thing while "normal" bitcoin is just chugging along with unchanged block size. It's all fine and well that Satoshi may have wanted something different for block sizes, but he hasn't been involved in bitcoin development for over a decade now so his wishes are pretty irrelevant. Right now, the vast majority of "bitcoin" value is in the original one and speculating about how things could be different is just the crypto version of "world peace is easy if we all could just get along".