To anyone talking about an off chain solution, just so you know the L1 network is the barrier to entry to the L2 network.
Unfortunately some people either only consider on-chain or off-chain scaling solution.
If something like this BIP were to be implemented, I would suggest the automatic growth be limited to 10 years, and after 5 years, a new hard fork can be implemented (if there is consensus) to extend the growth indefinitely.
I agree, 5-10 years seems more reasonable than 40+ years. But what do you think about the growth percentage? Is 17.7% is just right or feels too big considering Bitcoin community is conservative?
The additional storage cost of including a transaction is close to zero.
Does that mean there is no miracle solution to spams?
"Miracle" doesn't apply when we talk about technical problem.