Let me make a few observations here.
We are being told that removal of arrows from the economy requires them to remove one digit from the amount of gil you can carry, and reduce total gil possessed/introduced. OK why? If the actual economic change is net 0 why does removing arrows require them to do this? A net 0 change doesn't actually adjust anything. And if they just want to remove a digit from the inventory then why reduce gil introduction by 1/10th along with it?
We are accepting at face value that the this is a 1/10th reduction across the board, but that assumes that the number of players on the existing servers doesn't increase by any appreciable amount. If in fact the number of players per server increases by a factor of 10 then reducing the amount of gil given by NPCs by 1/10th results in exactly the same amount of gil being introduced into the economy as is today. It's just spread out amongst more people at the start.
A server population increase is a much more plausible reason for them to do this than a single consumable item making up 90% of the game economy, and server populations are much much lower today than they will be in 2.0. This seems more likely a redistribution of wealth than an adjustment for a change to archer.
If I am correct and this is an adjustment to the economy to accommodate larger populations then SE has no choice but to make this change. The alternative is massive inflation if they don't change the amount of gil introduced. Alternatively if they let us keep all our gil but reduce NPC gil to 1/10th it would result in a totally unequal distribution of wealth between new players and old players with new players heavily penalized in their ability to catch up by the new NPC rates. This situation wouldn't be dissimilar to what happened to people who started XI around the EU launch and joined an economy dominated people who NPC'd low level fish for 100k+, but new players get 10 gil for the same fish today. It would be totally unfair to new players who will now make up the majority of the player population not to adjust the economy accordingly. It would only serve the rmt to create that sort of inequity.
Where I have a problem with this is they should be upfront with us if this is what they are doing. Also they should give those players who invested time and effort in making and saving gil some sort of in game compensation, albeit in a form that can't be converted into a similar amount of gil, for their time investment.