You may not fully understand bitcoin or fractional reserve lending. For lending, think of bitcoin as silver coins. If people only accept silver coins as payment, and the bank only lends out pure silver coins, how will the bank lend out more silver coins than they ever had on deposit? If the bank is collecting 6% interest and they have no business expenses, they certainly can lend out their own profits, but that's still not fractional reserve banking.
This has nothing to do with religious fervor or idealism. It has to do with generalized distrust of any fiduciary media other than the hard asset itself; in this case bitcoin.
People won't reject fractional reserve banking per-se, they will reject the fiduciary media that is being lent out because its an insolvent imposter of a hard asset.
With fiduciary media you mean the checking balance (denominated in Bitcoin) in the bank's database?
It's funny, we seem to be accepting the sats paid on this site in form of fiduciary media. As long as we trust they can be withdrawn over LN we use them as checking balance, because it's easier to just click on an arrow than to make an LN payment every time.
I don't see why the majority of people will no longer accept fiduciary media (denominated in Bitcoin) in the future. I agree it's possible, but I don't see it as an intrinsic attribute of Bitcoin that must have that effect.
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A ledger balance at a bank is not fiduciary media. The medium by which you transfer these balances between accounts and banks is fiduciary media. You can transfer balances between accounts at banks by wire, money order, check, ACH, electronic transfer between internal accounts or BANK NOTES (a.k.a. US dollar bills). To get the dollar bills out of your account, you go to a teller and they give you bank notes.
Never did they give you silver or gold money from their vaults.
Yes, SN is a custodial wallet. It is possible that SN spends the bitcoin out from under the balances represented in our accounts. Yes, we could be sending sats back and forth without us ever knowing that @k00b is operating his service at fractional reserve.... That is until one day his balance goes so low that SN can't satisfy a request to pay an external lightning invoice. Then someone screams, "hey where is my bitcoin?" To everyone, and there is a bank run on SN.
This is the difference between fiduciary media and money. All are IOUs, but money is a hard asset. Bitcoin is a hard asset.
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