Recently, there have been proposals aimed at reducing the gas cost of rollups.
See for example EIP-4488: EIP-4488: Transaction calldata gas cost reduction with total calldata limit - #9 by vbuterin - EIPs - Fellowship of Ethereum Magicians
If such an EIP were to be adopted, what affect would it have on the gas costs of a typical state channels transaction?
Because this EIP only talks about reducing the amount of gas, it’s clear that the amount of gas will go down. But what really matters is the cost in ETH of a transaction, which depends on the transaction fee market. I would suggest this implies that although some transactions will become cheaper (in ETH), some other transactions will become more expensive (in ETH). And I would imagine that state channels transactions likely fall into the latter category.