If you ask me, and most of my friends, cataclysm should have option to move chars on mop and option to refund items as I spent a lot of coins on chars that I will NEVER EVER play again most likely no matter what they do with Cataclysm (I just like Icecrown way more, got fed of cataclysm).
Warmane wouldn't have any loss anyway as refunding coins of items would be just invested into something else on Warmane so they would keep money. People are tired of Cataclysm long ago, most of them moved on another expansion, I am sure letting cataclysm chars merge into MoP / Refund coins would make A LOT OF Players on warmane happy, no matter where they are at the moment.
But yeh... Sadly... Staff don't even care about anything about Cataclysm, they didn't bother even opening low level instances for ages when Cataclysm was active and needing it, so I doubt they will even notice our messages here and if you open support ticket, they nicely tell you there is no plan about this stuff aka they don't wanna bother about this.