The question is more interesting than it looks like.
I understood it as, what is your attachment as a fan.
To me, I'm attached to the spirit. Being a Celtic or a Boston player has its own way of competing that is unique. DA, Doc PP and KG manage to keep that spirit the last 6 years or so.
My answer is I will follow and continue to be a fan of that wherever the spirit goes. If it stays in Boston fine, if it goes away in another city I'm also fine, regarding of the win/lose production. Because it is only this mentality of boston celtics that makes me watch NBA.
LGC