The more people using ETH, the more computation that will need to be done. The more hardware that will be needed to support everything. The end goal is scalability, right?
As hardware accelerated and parallel ZK proving technology increases, the amount of users and applications built on this technology can also increase. This is the opposite of Proof of Work, where more efficient mining rigs and higher hash rates will not lead to more network throughput or activity.
I'm saying that zk is being targeted for ASICs (Vitalik said it himself) and that zk will require some very specific compute needs that not everyone is going to be able to provide.