FlareHabanero
Banned via Warnings
Don't know, even with the height of popularity of Golden Sun and Isaac being among the more popular picks during pre-Brawl, Golden Sun got really snubbed with content (not even a single sticker). I have a feeling with the waning popularity of Golden Sun (especially in Japan where the popularity fell off the map), something similar might happen again. As to why Golden Sun was ignored and Isaac only appeared as one the few decent Assist Trophies, who knows. Might have to do with not wanting too many newcomers, might have to do with focusing priorities on "finishing" the existing series, might have to do with time constraints forcing a minimal amount of content (kind of like how it's implied with Saki), or maybe there was some copyright conflicts that made inclusion a tad more difficult then usual. But whatever the case may be, at the moment there are some doubts that Golden Sun might expand into a fully established universe. It might depend on whether or not Pre-Brawl popularity is being used as a basis for inclusion, or the staff do see something interesting about Isaac and Golden Sun and want to implement content.
As for Xenoblade Chronicles and Shulk, again one advantage it has over Golden Sun and Isaac is the timing. The height of popularity was around 2011-2012 during the time Xenoblade Chronicles was being localized in other regions, with the planned roster for the new Super Smash Bros. game being compiled sometime during 2012. To add more fuel to the fire, there has been some interest in including Shulk in Super Smash Bros. by official staff at Monolith Soft. Namely Kaori Tanaka (aka Soraya Saga), wife of Xenoblade Chronicles director Tetsuya Takahashi, who stated she was hopeful for Shulk's inclusion. But who knows, that might get snubbed for what ever reason too.
As for Xenoblade Chronicles and Shulk, again one advantage it has over Golden Sun and Isaac is the timing. The height of popularity was around 2011-2012 during the time Xenoblade Chronicles was being localized in other regions, with the planned roster for the new Super Smash Bros. game being compiled sometime during 2012. To add more fuel to the fire, there has been some interest in including Shulk in Super Smash Bros. by official staff at Monolith Soft. Namely Kaori Tanaka (aka Soraya Saga), wife of Xenoblade Chronicles director Tetsuya Takahashi, who stated she was hopeful for Shulk's inclusion. But who knows, that might get snubbed for what ever reason too.