It continues to grow--more details here, including a look at one NBA game Donaghy officiated last year that, now, given these allegations, looks...kinda fishy. That's the thing about scandals such as this--everything gets called into question.
The NBA can survive this---although if, as this investigation continues, another referee besides Donaghy is implicated and/or a player or players is implicated, then this could be the biggest crisis the league has ever faced.