The way I see this climbing boots update, is that it's not as bad as people think. First off if someone like you say Benjy has 400k climbing boots, he is never going to sell all those, especially before the price crashes rock bottom from everyone selling them. Plus who is going to buy thousands of climbing boots with the price crashing?
Uh, yes it is.
There is this magical thing called high alchemy, when everytime you alch a pair of boots, you get 45k.
So, suddenly billions and billions of coins enter into the runescape economy.
More money comes in, those people who have the money will start buying armor, weapons, rares, supplies, etc, driving up the prices for everyone else.
So, gf me wanting 99 construction anytime soon. :(