Why do you say that Sleepy? That isn't what happened with poker for example. I was a professional poker player and moved overseas after black friday. But the result for the remaining US facing poker sites was mixed. Some sites did well and others did not. Many sites including old/new one's like Carbon, America's Card room (ACR) etc continue until today. Other sites such as Lock Poker were dishonest and took player money.
The backlash on the US govt for shutting down the big 3 at the time (Full Tilt, PokerStars and UB) was huge and to date they haven't touched to my knowledge any of the remaining sites.