The low fee argument is weakest while Bitcoin is relatively small; that's why exchange fees factor in (people need to buy in and cash out. Volatility, PoW has been done to death). But it is also only weakest in selected areas. I wouldn't say an area that has an average 12% remittance fee is not ripe to be picked by bitcoin remittances (especially if bitcoin operates behind the scenes as company develops their own avenues / relationships at both ends).

This new European cap is good for everyone and high time the financial sector stopped the gouging. But if bitcoin gets a proper foothold, a 2% seawall won't stem the tide. In the upside-happens for bitcoin possibility, btc can limbo lower than the legacy sector. Until then though, your point stands.

As (or perhaps 'if', considering your perspective) bitcoin matures enough that users can stay within a bitcoin economy, then low fees are a positive. So, the more it expands, the more relevant the argument.