That kind of napkin math is both dangerous and misleading. The block size limit is a security parameter, and the math above assumed that nobody was trying to at

That kind of napkin math is both dangerous and misleading. The block size limit is a security parameter, and the math above assumed that nobody was trying to attack the network. In attack situations, a larger block size is more expensive and more dangerous. Also, the resource requirements for running a node are a lot higher than most people are willing to tolerate even at 1mb blocks. Huge portions of the incentives, security, and decentralization of the network depend on people running full validating nodes. A big misconception in cryptocurrency is that miners can set the rules of the network. That's only true if you aren't running a full node. The dynamic block size in ethereum is an easy attack vector that can be exploited by a large miner. The miner simply increases the blocksize as much as possible, and fills blocks with autogenerated transactions to make verification more expensive for small nodes. Once you get it high enough, your competition will start dropping off the network. If home users stop running full nodes too, now it's a lot easier to change the rules of the network - instead of convincing everyone, you only need to convince everyone willing to pay for a full node. And if that's tens of thousands per month, it's not going to be many people.