"not many coins left to be mined"

so?

So if everyone holds it as a store of value and doesn't transact in it because that's too expensive to do compared to say Venmo... then how does the system not entirely collapse as remaining coins to be mined dwindles. There would need to be some reward to miners coming in the way of fees. Do you send any of your friends bitcoin or do you just venmo them?

yes miners will collect fees for final settlement for a much larger second layer for smaller/daily transactions - again going back to the layered money idea. think trading paper money backed by gold for daily transactions with monthly yearly physical gold settlement

good podcast explaining the layered money idea and lots of money history