I think that Proof of Work needs a serious revamping including a more energy efficient and greener outlook or it will be lost to better consensus algorithms like Proof of Stake and Delegated Proof of Stake. Today Proof of work mining leads to centralization due to the cost it takes to run a rig decent enough to make a profit. I think Satoshi knew Proof of work wasn't sustainable enough to secure his vision so he made the project open source in hopes of someone adding to the code or using his genius to create another.