@Lil:
I think that Funimation may not dub season 4 in america becuz they have Fairy Tail to dub and that is a long running anime like One Piece. It would take too much work to dub two shows that could potentially reach episode 1000. Or 500 in the case for Fairy Tail. but I really hope they dub One Piece season 4 cuz this show is awesome and I know I will love Fairy Tail too cuz it's similar to this and has better animation. I can't wait for Fairy Tail to come out here and season 4 of One piece!!!!
they don't just have fairy tail to dub they have lots and LOTS of shows ,but that has not stopped them before.Besides as much as i love fairy tail One Piece has a much bigger fan base and in my opinion (as i imagine most people will agree with me with this site playing host to one piece) just blows fairy tail out of the water in terms of comparison and what funimation fans will want most.
Also Fairy tail is currently only 94 episodes long,whilst one piece is over 500.If you think they would not dub one piece becuase they beleive fairy tail will be another extraordinarily long series(in which we have no concrete proof at this moment in time),then why would they after having gained the license and dubbed the beginning of fairy tail,be in negotiation with toei for more episodes?In my opinion one piece came before fairy tail,and going by your logic when (and i do beleive it its a WHEN) they have dubbed say 500 episodes of one piece,the fairy tail saga will be quite far behind and if any show was likely to have dubbing discontinued because of your arguement of series being too long,it would be that.