If there were a lockout like in 1998-99, where basically only a half of the season was played, I think that would really benefit the old Celtic roster.
Also, I watched that KG interview, and I didn't necessarily think he was talking about retirement. I think he just meant his future is uncertain, whether that be due to retirement or changing teams. His contract would be up at that point, and I think he would just have too much basketball to offer still to retire, and the Celtics would most likely not be contenders at that point.