[CryptoPunk]

>>You can currently add a transaction to the Bitcoin blockchain for (converted) approximately one US cent.

That's irrelevant. The only reason you can get away with a low fee on the Bitcoin Core blockchain at the moment is that it's not operating at capacity. As soon as adoption picks up again, fees will start to climb - they have to because capacity is constrained. At any globally significant level of usage, fees will be astronomical.

Remember, as recently as December 2017, BTC's average transaction fee reached $30.

>> but the idea that someone that can afford to run a full node will not be able to afford to insert a transaction does not hold up under basic scrutiny.

That's absurd. 1 MB of space in each block allows for a maximum of 604,800 transactions being written to the blockchain a day. There is no way that fees for writing to the blockchain wouldn't skyrocket, far out of reach of ordinary users, at any significant level of adoption.