After today's GM event, I think that keeping 2 worlds was a good decision. I think if they implemented more crossworld features (crossword buddy chat, crossworld bossing, revamped crossworld pq with good rewards and decent exp as an alternative to grinding, etc.), then being on separate worlds wouldn't feel so bad and would resolve some concerns people may have with the merge. Also if they plan to implement KMS features like the auction house fees, then we better also be getting all the quality of life improvements they had such as being able to buy/sell cubes in the auction house (a feature that existed before magic wand took over).