No they don't need all of Satoshi's principles, his system isn't perfect, no system is. Bitcoin wasn't designed to last forever,
Lets say its true.
Bitcoin is people actually. People tend to forget that. There are 3 sides of this, Developers, Miners, Nodes operators/community. Each side works to benefit Bitcoin, if something is flawed or need fix/rework. People will do this, one of these groups or all of them at once.
Its perfect because its adjustable like people are, and thats why people succeed and they adapt to do so all the time.