I agree with you - and I think the SIAI focuses too much on possible future computer programs, and neglects the (limited) superintelligences that already exist, various amalgams and cyborgs and group minds coordinated with sonic telepathy.

In the future where the world continues (that is, without being paperclipped) and without a singleton, we need to think about how to deal with superintelligences. By "deal with" I'm including prevailing over superintelligences, without throwing up hands and saying "it's smarter than me".