the exchanges is still going, if you have five mins just read it. Mike made a few others valid points imho in subsequent messages.
And those from Thomas Zander deserve a quote.
> The only way to see how fees would work in practice is to have scarcity.
This skips over the question why you need a fees market. There really is no
reason that for the next 10 to 20 years there is a need for a fees market to
incentive miners to mine. Planning that far ahead is doomed to failure.