Should Canon make a few ultra-fast, 1.8 or faster, lenses with IS?

Should Canon make a few ultra-fast, 1.8 or faster, lenses with IS? I know they have a 24 and 28 2.8 w IS.  But I think about what would be like to have the 85 1.8 or 1.2(maybe to big for IS) with IS.

A F1.8 lens, lets says a 35mm,  50MM  or 85mm, would give you very low light, near tripod abilities.

I almost bought a 135mm F2 but I need IS for that length in a dark church.

Yes, I know IS added weight, and about 400-500 to a lens costs, but Canon could offer the same lens with and without.. Just like the 70-200 F4