Hive Engine has had Tribes for a while now. The solution absolutely exists. You also said it'd be the same as declining rewards - declining rewards also exists
You could be using an L2 solution right now and not accept HIVE rewards. It does exist. It obviously exists. You're not using it. You had your choice of both where to start the convo, and whether or not to accept rewards. You chose base layer + rewards
ETH isn't the only chain with staking... err... will have soon. You know what I mean
There are hundreds of chains staking for rewards and nobody cares about them. If the value of other tokens is the driving purpose for change, then why look at ETH? BTC is more valuable. Let's strip all data but xfer out - then we can be as awesome as BTC!