Picking Bob Odenkirk as Saul might be one of the greatest casting decisions ever made. It's an absolutely perfect fit, and I can't think of anyone else who'd come even close to making that role work.
If Mike is in it I'll definitely give it a shot. He may have been my favorite BB character.
This show may never be as good as BB, but it doesn't need to be. Every person who watched BB will watch this show...at least to start. If I had a guess it will start just as slow as BB and that is ok. BB's first season numbers were horrendous and if it wasn't for Netflix it may not have ever lasted as long as it did. Because of the success, AMC will have a huge following for this show and it will go on for as long as Vince and AMC want it to.