My 2 cents says this law will be challenge on several fronts:
1) The banking industry is going to fight real hard to get their part in this bill removed. It’s next to impossible for banks to institute anything in the next 2-3 years, no matter 270 days.
2) The WTO is going to come into play on grounds of unfair trade practice. Antigua was a nice little trial balloon, but the UK is making online gambling completely legal, and the EU recently forced those countries that were prohibiting online gambling to allow it. One if not more of these countries will likely jump into the fray with poor little Antigua (or should we call them David as in David and Goliath). Maybe the companies that are setting up in the UK will urge the UK to jump on this, they did loose $6B in market value after all, what clearer a case could you have to prove unfair trade practices (online horse betting, lotteries and some fantasy sports are legal in the US now).
3) The ACLU will jump into the censorship issue (blocking websites that have links to gambling sites). At least I can’t imagine they wouldn’t challenge that clear violation of free speach. The new law doesn’t say you can’t have affiliate links, it says you can’t have any links.
Again, all my humble opinion, but I don’t see this law amounting to much.