Obamacare is imploding. But thanks to the government shutdown, everyone is talking about the implosion of the GOP instead. The shutdown drama has distracted from the fact that Obamacare’s debut is worse than many realize — and it threatens the fundamental viability of the law itself. The administration claims the Obamacare online exchanges crashed because the Web site got more than 8 million hits in the first week. Please. You know how many people visit Amazon.com every week? More than 70 million. The difference is: 1.) Amazon seldom crashes, and 2.) on Amazon, people actually buy something.