Without rmah it wont be pay2win that much plus there were thousands of players spending 90% or more % of their diablo time on ah only. Loot 2.0, crafts bound to account, items rolled by mystic bound to account, no rmah, no ah - people will focus on game itself and many "proffesional boters" will focus on other games. Sure, outside trading on forums will be very common, like on d2, but remember that it became popular on d2 also because of mass dupe. Ingame and channel trading will be popular.
Sure, d2jsp, ebays, d3shops will grow in power, but i see much more pros than cons.