1. It will only be a disaster for the people planning to make significant money from it, without considering the RMAH is an enormous
experiment which Blizzard is facilitating. No one knows how it will turn-out, so no one should be counting their chickens...
2. It will be profitable for Blizzard because people will be "buying" credits in multi-dollar amounts, e.g. $10, $25, etc. and Blizz will be getting their percentage at that time. Blizz won't be trying to make a profits from the sale of something costing 5-cents...
3. How people react will be the $65,000 question. I believe this is why Blizz is trying this = to see if they can use it in future games.
People can argue till they are blue in the face, but until you "run it up the flagpole, and see who salutes..." no one knows how the cards will fall.
I'm really curious to see how it goes, because we
will be seeing a lot more of this
if it is popular with players.