I remember when Proky made this statement upon becoming majority owner of the New Jersey (for now) Nets last season and I have to say that I was somewhat skeptical. But after doing a little research, I don't think Proky was all that far off to say what he did. For example, take a look at this link to a 2002 NY Post article written when the Nets made the NBA Finals: http://www.nypost.com/p/news/fans_caught_trans_jersey_bandwagon_iVvZ2Gj0FrmK5kQFJ3UctK. In it, there are clearly Knick fans who became Nets fans (if even for just a short while) and as the Post notes, one guy even went so far to buy a Nets jersey.
I say all this because if there were Knick converts during the Finals years, then there will certainly be converts with next year's move to Brooklyn. Brooklyn has distinguished itself and has become to be seen as it's own entity separate and apart from the rest of New York (specifically Manhatten) and this can only benefit the Nets. If the Nets do somehow get Dwight paired up with D-Will, I truly believe the floodgates will open in terms of fandom and the Nets will be a better franchise because of it.