I don't know how it is in the West when an artist goes major.
But when I look at the reactions of Japanese fans on Twitter and other social networks whenever an artist/band goes major well, 99% of them are enthusiast. Different mentalities I guess. Maybe they're just less hung up about being indie and it means less over there.
Thinking about it, this doesn't happen too often in Japan, but in the west it sometimes it means an artist's sound is changed to be more mainstream so people get worried, I know quite a few western fans were scared of Oomori going major but there was nothing to worry about there, she just got even better. Same with Daoko. I'm not that worried about Charisma.com, their recent songs have been more pop-ish so I don't expect a big change.
...
Shiina Ringo's first international show is going to be in Taiwan, in the announcement it acknowledged there are lots of fans in Europe and America, so it's likely she'll play shows there too. The setlist is being chosen via votes.