shiina should have the right of singing in gibberish if she wanted to. So I voted yes. But I highly doubt that she will ever be as universally accepted as Bjork is. Shiina's music is intelectually too tame compared to Bjork ( even though I like Shiina's music INFINITELY more).
But, if Shiina ever does an album only with vocal samples, and features guests like Mike Patton, Rahzel, Matmos and Dokaka, I'll be more than glad to change my opinion...