dollars per block depends on bitcoin price, you can have full blocks, if bitcoin price crashes, dollar per block crashes, the big gains is still the coinbase reward and it depends on usd price, we have seen hashrate going up with almost empty blocks, because price was up. Bitcoin network rewards does not need to double after a halving, neither does Bitcoin price, there is no requirement for that, hashrate will always be balanced according to price. And your solution is no guarantee that demand will come, even because with bigger blockspace fees will be lower.

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“The big gain depends on Coinbase rewards” Yes exactly and that will go away fast… so not sure what you are talking about honestly … In few halving from now if we don’t see onchain demand growing we will have a problem You can bet on demand growing or price growing to 20-30 million I’d rather add few other things that I believe would be great for bitcoin and that can increase chances of having stronger block space demand
There are many factors that you are ignoring, you are only thinking on keeping total reward value consistent across halvings wich is not required, neither does hashrate needs to increase in the same rate across halvings. Is current hashrate at current price low, high or just right? Do you know?