Like I said, there's no way they'll air the entire series (or, what has been produced of it so far). If it was on WB, they MIGHT, since they've had to go through all of Pokemon and Yu-Gi-Oh! Those are both properties that can easily be promoted in conjunction with games and other merchandise, though. One Piece doesn't have a "collect em all" hook like those two do. The closest Fox has come to being consistent with Saturday morning anime properties is Digimon. Cable is MUCH better suited to running a long-term series like One Piece. I still think it should be on Adult Swim.
Edit: The bigger problem is that this fiasco could completely ruin One Piece's chance for major popularity here. With Shaman King already having bombed outside of SJ US already, OP could suffer the same fate. Sure, OP is a better series than Shaman King, but you can't deny 4Kids had a big hand in sinking that property.