unaffordable if you think in terms of fiat.
If you think in bitcoin terms, 2 to 3% transaction fees for an inmutable store of value is nothing. 
Even in real estate you have to pay 5% to the broker and 2% transfer tax paid to the state and city.
If your house is worth 500k, you have to pay $35,000 in fees.
Bitcoin is a much better store of value, so paying  5 to 7% is still a bargain 

 For his group C I suspect the fees will be  >100% the value they're trying to move. Not everyone will be bitcoin rich. Most folks will be transacting in amounts that would be less than the transaction fee for a global settlement later txn no matter what you denominate the amount in I expect