Both BTC small blocks high fees and BCH big blocks small fees are an economic gamble. It's not a guaranteed outcome that Bitcoin will have a sufficient security budget in the next decade and after. Markets will trade with that knowledge far in advance.

That's also why Monero introduced tail emission (not because Monero devs love inflation so much) and why Peter Todd is bringing it up.

In an ideal world a fixed money supply would be perfectly secure and sound. The world rarely is that perfect so we need yo learn to manage tradeoffs.