But if the majority of small value transactions are off-network, the majority of Amazon-cartel's transactions will have no mining value anyway.
Ifs have nothing to do with my attack. We can debate if there will be nuclear winter this year too. I am not here to debate every possible exogenous factor in the universe.
If the blockchain is not the majority, we no longer have decentralized currency any way. Private offchain currencies means cheating and fractional reserves, which means failures and government intervention.
Reduced costs are free costs to someone.
No they are not. Zero fees still bankrupts a miner with very small costs.
inflation coins without the block reward reductions already exist, and have for years.
Obviously inflacoin is not compelling, because high levels of debasement are not very enticing to those who think a small coin supply returns greater ponzi system gains (oh we know they rationalize away that it is really a ponzi scheme so they don't pay attention to that tradeoff of not distributing new coins perpetually).
Large debasement and no other significant advances over Bitcoin are not going to succeed in the market place.