NEW YORK — New York desperately needs another sports championship because, with all due respect to NYCFC, there are New Yorkers in their 30s who weren’t old enough to (legally) enjoy an adult beverage during the last celebration. So in this market, yes, such an accomplishment by the Brooklyn Nets, as far-fetched as it may seem today given their current lot in the standings, would provide excitement and relief and maybe generate collective NYC momentum after two exhausting years. For the NBA? Not so much. A Brooklyn title is something to worry about. The Nets have blatantly treated the regular …