agreed, to spend small amounts, the fees would be silly.

In reality, people will use what works and is easiest for them.

My concern about where Bitcoin is heading is around the security of the network. How would miners be incentivized if in less than 4 years, their current earnings will halve, but costs will increase.

Would Bitaxe-type machines become more accessible? "a miner in every home" - idk where the economic incentive is, but someone needs to maintain it