This is definitely something I've been thinking about while reading Weekly Shonen Jump; I think the magazine is definitely struggling to find something to replace the juggernaut that was
Naruto. There was definitely talk about
Toriko having the potential to take
Bleach's slot but ultimately, that didn't take off (and I think FUNimation noted that the sales of their anime releases were below expectations). I've also noticed that a lot of series' in the magazine have been brought to rather premature ends lately, such as
Stealth Symphony,
Hi-Fi Cluster and
E-Robot.
I think that if the manga stuck to the main story a bit more instead of going off on tangent chapters,
Nisekoi would easily have the potential. I'm not sure how well the collected volumes are selling in Japan, but they often rank in the New York Times manga bestseller lists, the anime was pretty popular and its merchandise appears to be selling pretty well (I was lucky to nab pre-orders for the Onodera, Tsugumi and Tachibana nendoroids on AmiAmi before they closed and am still kicking myself about missing Chitoge).
Another possibility could be
Food Wars: Shokugeki no Soma. I'm not sure how well the volumes have been selling in Japan, but that series often appears in the U.S. charts too. Also, while it's an older series and has been in Ultra Jump since 2004, the recent television anime adaptations have given
JoJo's Bizarre Adventure a pretty big boost at least in the west, with pre-orders for its print volumes ranking pretty well on Amazon and its games even being localised for release here.
In regards to
Seraph of the End, I've been reading the manga since its serialisation in Weekly Shonen Jump started and to be honest, I've found it to be incredibly generic (which isn't helped by vampires being generic anyway).
Lutga said:
A lot of people are talking about Yokai Watch finally make its big move on the West this year - I suppose if it plays its cards right it could easily become the next Pokemon/Yu Gi Oh, but who knows.
I am definitely keeping a close eye on Yo-Kai Watch (both from a video game and anime standpoint) but I am admittedly curious as to whether it having a more Japanese flavour than the relatively international
Pokémon could inhibit its success overseas or not.