The action is directed at affiliates, not operators.
You can read the Advisory Bulletin here:
http://www.onlinepokerreport.com/wp-...Affiliates.pdf
Thousands of affiliates might feel like a stretch, but consider that we're talking about affiliate sites promoting poker and affiliate sites promoting casino. That gets into the hundreds easily.
Effectively this is the DGE requiring affiliates to make a choice between promoting US state-regulated sites and offshore sites. The greater impact may be that other states - such as PA - follow NJ's lead and adopt a similar policy regarding affiliates out of the gate.