You would only need to change it if there was a sub-satoshi hardfork, which doesn't seem necessary anytime soon.

We shouldn't make any assumptions about the future price of bitcoin to make the decision.

Hmmm ;) Didn't you just make an assumption about the future price?

This sounds very US-centric to me. Aren't you thinking in usd?

The currencies I'm familiar with are CHF, USD, EUR and GBP, which all have roughly similar values. I guess such currencies make up the bulk of the Bitcoin userbase at the moment.

"People seem to like mBTC" is just an ad populum fallacy: millions of
flies can actually be wrong. Also you haven't showed them micros,
maybe they like it too.

Saying "it's already popular and would take work to change" is not really a fallacy now, is it?

But anyway, this is getting silly. You don't have to convince me. Go visit all the services I listed above, plus all the ones I didn't find in my five minutes of searching, and convince them they're wrong like the flies and switching is the best use of their time :o