That's not true. If ETH gets devalued through inflation by too much the security of the network would be compromised. They are explicitly moving to a 100% proof

That's not true. If ETH gets devalued through inflation by too much the security of the network would be compromised. They are explicitly moving to a 100% proof of stake model for securing the network (already partially deployed). This directly incentivizes stakeholders to protect the valuation of ETH. Finally, if EIP-1559 is implemented, the network will begin burning transaction fees. That is to say, it's possible in the future more ETH will be burned via transaction fees than produced from staking, in which case ETH issuance will go negative.