I agree that it will evolve over time, but the rewards system of the site determines what an optimal zap is more than the fiat exchange rate.

Keep in mind too that quality might improve, such that the zapping amounts don't seem quite so unrealistic.

This answer makes sense to me. Obviously no one, no matter how much they believe 1 sat = 1 sat, is paying 10k bitcoin for a pizza anymore. 

Scoresby

Over a long time period there is a relation. In 2011 there were online fountains giving away 0.25 BTC for clicking a button, those disappeared once we broke the $1-$3 range.

If SN had existed then do you think we would be happy sending/receiving 100-1000 sat zaps? It would've been 100x that. 

Likewise, in 4 years when BTC breaks 1M, people will not be giving 1000 sat zaps ($10) 

freetx

POLL: When BTC price goes up, does your zap amount go down?

I'm curious how other stackers will answer. For me there's no relationship between the two.