Not for me.
For me, I have really never followed an athlete after they left one of my Boston teams. I wish them well but really don't care about them.
So if KG and Pierce and Ray and Tony and Posey and Doc are elsewhere, if they win, they win, if not, no biggie. I want my team to win.
Maybe I am old school that way but for me, I really am a "The name on the front of the jersey is more important than the name on the back of the jersey" type guy. I never got into the NBA's public relations push of getting fans to be fans of players instead of teams. It just never worked on me.