The idea that anyone of any party is going to be elected Speaker without being a sitting Representative is one of those technical possibilities that is practically ridiculous. The succession issue has NEVER actually been invoked, but the Speaker is an essential part of marshaling support for the majority party's legislation agenda and has a pivotal role in getting anything at all to happen in the House, and stopping anything bad from happening there. Except for one or two severely retarded individuals like Mad Maxine, nobody is going to play that.