i think very likely it's overall going to be the case that fee rates fluctuate from time to time for various reasons but for the most part will stay within a fairly close distance of a reasonable percentage of transferred versus fee
the ordinals are really an exploit of a weak part of the specification, and i'm confident that this will be resolved in a few months time
and yes, ETFs will take a heap of trader movements off the chain and into the exchange ledgers, so it's probably going to mean the lower end of fee rates starts to fall further than it has in a while due to a substantial reduction in demand