Wtf? Have you not watched Prisma? That IS Ilya's route.
That is not my Ilyasviel von Einzbern who suffered so much and had so little happiness in her short life. That is a fanservice cash in of the worst kind.
Ilya in Prisma has as much to do with Ilya as pic related with Shirou
Oh right, Shirou/Ilya is indeed the best girl. How could this have slipped my mind?
Prisma is pure fanservice. I even doubt that Illya is going to win the onii-chan,
Here's some official art featuring a female Shirou. (Rin looks like a smug asshole, which is fitting I guess.)
Shota Ilya has much better luck than regular Ilya
Would Shirou try to be an ally of justice by becoming a magical girl?