I think eventually Taz and Joe will go their separate way and turn on Angle, but not back to AJ and Daniels, but more a sole "nation", maybe eventually incorporate Richards and Raven into it. Having Joe head a stable of "legends" but still remain heel will push him further, and allow for feuds down the road with AJ, Daniels, Abyss, and all the other face TNA guys. Perhaps even wait until October and have Joe screw Angle out of the title at Bound for Glory. Being they want that to be their big PPV, it would show Joe as an impact player for the company. Maybe have a triple threat where Joe is there to ensure Angle wins, then as Angle goes to cover whoever the 3rd person would be (probably Foley or Jarrett or Sting), Joe grabs Angle and does his clutch submission. The Rock really broke out once he took over for the Nation, so something similar with Joe heading a faction would definitely be good for his career.
But yes, Taz can debut successfully, but only if they're willing to go through it and keep him (Tazz) relevant...debuting him and then having him end up like Lashley would be unsuccessful