That's like saying "if the gays can get married, whats to stop people from marrying their pets!". How can you seriously compare raising the block size limit to a slippery slope of raising the total supply? Nobody wants to devalue their coins by creating more, but they DO want to increase the value in them by making them more accessible and liquid.
A forker can troll us with an argument of the following style:
"High tx fees reduce adoption, so we need low tx fees to increase adoption. If that doesn't happen, BTC is dead. So it's preferable to have more than 21mn coins through constant inflation rather than raising tx fees".They could say
"you are crippling BTC's potential through those high fees, we need much lower fees and in order to do that we need subsidy / more coins".If people insist on having low-fee txs, then the end-game is a ...DOGEcoin (infinite inflation).
Higher fees solve both the inflation issue and also address the sane block utilization issue.
Fees at 1 to 3 cents are ridiculous anyway.