i have had 2 failures in the family...one for lifters, one for crank issues. go read what is happing...not all are manufacturing TOLERANCES, some are due to thin oil selection. some are due to debris, others are out of spec components.
"I" believe this is why very little is happening, GM trying to pin down the actual issue per VIN run (if possible), to eliminate as much of a hit a possible. Remember, AAM is or could be just as much a part, and responsible for some of this...it will go back in them, just not by name as loud.
If it does, you may see AAM go up for sale...