This is true, but breaking changes, aka hard forks have occurred in the past and blocksize has already been successfully increased from 1MB to 2MB. It will all

This is true, but breaking changes, aka hard forks have occurred in the past and blocksize has already been successfully increased from 1MB to 2MB. It will all come down to whether miners think they can make more from having fewer higher fee txns vs. more lower fee txns in a block. My prediction is that more lower fee txns will win since competition from other cryptocurrencies will cap the txn fee that people are willing to pay.