I still think Blizzard will introduce the RMAH in WOW in 2013.

They'll gather experience in D3. Then they will redesign 50% of the loot in WOW. raise the BOE gear drops along with very random (almost D3 like) drops. Redo the Mats and hop you'll be in RMAH WOW before you know it. With 50% of the absolute top gear still on BOP to motivate raiding and certainly 75% BOP of PvP gear.

They need to search for grinding zone solutions by making these BOE drops complete random and the pet system already works in both kinds of AH (gold and RM).

If successful the income from a RMAH along with the Pet sales can make up for the subscriptions of 13 Euro a month before you know it.

And really I do think the subscription based models are out of date.

SW TOR will prove just that: a massive exit of players once the subscriptions need to be paid past the 3rd 4th month. It has been that for the last 6 years already. That 70-80*% drop will not be stopped by voice overs or cinematics.

My guess is that Blizzard will introduce the WOW RMAH between the 4th and the 5th expansion, say early 2013. By that time fixed subscriptions will cease to exist. I never believe the new MMO from Blizzard will even have one.

RMAH is much better than designers selling goods in lame shops or players getting frustrated they need to pay monthly just to be able to log in.