Oh the Irony.
The reason Paralell World Fusion is going to be expensive is NOT because of Fusion based decks, but SYNCHRO based decks.
Now Konami had better NOT release a "Hero + Dark" Fusion
For those who dont get it:
Activate Paralell World Fusion. Return to the deck D-Hero Malicious and Deep Sea Diiva. Salvage and return Fenrir and another Deep Sea Diiva. That, or be holding Miracle Fusion.
See it yet?