There's no way he wont be in Inquisition. Remember at the end of DA2, Bodahn mentions going to Val Royeaux.
I would actually prefer to see Herren and Wade again. Theory has it Wade is meant to represent Bioware - the master craftsman, an eye to detail and working on bespoke pieces, living in poverty as a result - and Herren as Electronic Arts - the suave businessman, eye always on the bottom line.
Which may be why they didn't make it into DA2.