My guess is that nothing will happen. Casinos will continue, i mean seriously maybe 100-200 people log in on SG each day (on a good day) compared with the other 15,000 that would continue to play after the merge happens, is tiny. If they really wanted to they could block the IP's but I see no need, they won't do this as its too much work. If the Singapore Government (or whatever) have a problem with it, they'll just block Habbo which they won't do, so nothings really going to change (atleast in my opinion).