> So for Ether to generate even something like a meager 3% yield to beat inflation
Inflation eats away at a rate of 3%, so to beat inflation Ether needs to beat a -3% real yield, not a 3% real yield. A 3% real yield would mean that Ether appreciates at 6% compared to an asset that inflates at 3%.
> you need to charge on the order of 1%-3% for each transaction, which is orders of magnitude over what is expected or competitive.
That figure depends entirely on the total number of transactions and the fee paid by each transaction. It doesn't depend on the percentage of money transacted that is charged as a fee for each transaction. For many transactions, "percentage charged" is actually meaningless because the transactions don't even involve Ether at all aside from the payment of the fee. Ethereum is a virtual machine that charges for compute time.
> It follows then that the vast majority of the holders of Ethereum, and the backers of the scheme themselves especially, do not expect to earn from the fees, rather they speculate on the token itself, they hold it because it will appreciate in the future.
The vast majority of stock buyers do not expect to earn from the eventual dividends, rather they speculate on the stock itself, they hold it because it will appreciate in the future. That's just a feature of speculative financial markets - despite that, stocks plod along all the same.
> the preference of the vast majority of non-speculators is to hold on to currency and near money substitutes for periods much larger than it would allow holders of ether to earn trading fees commensurate to the risk of holding ether
Among other things Ethereum is a money transmitting service, not unlike PayPal. If we look at the money stock velocity of dollars on PayPal, I'm sure we would see that it is orders of magnitude higher than the general supply of all dollars out there.
> if the fees are negligible compared to the economic activity that is mediated
Hopefully blockchain scaling techniques will mature, and blockchains will be able to benefit from the economy of scale, charging fractions of a penny each for billions of transactions. That's the path this tech will have to walk if it wants to provide more value.