The question you should be asking yourself, MarAzul, is how the Executive Branch (whether the President, or HHS, or whoever) can declare that the populace can postpone following a law that's been passed by the Legislative Branch and confirmed by the Judicial Branch, for whatever reason. As I'm reading it, if the site isn't working well on Feb. 15 (the last date for you to get insurance that covers March, and therefore gives you 10 months that year of coverage and reduces the penalty), no one in the Executive Branch has the constitutional authority to say "we're going to ignore the penalty section of that law (1% of your salary or $295/family, whichever is greater) because the website's messed up." They can send an amended bill back to Congress, but I'm going to go out on a limb and say that no PPACA amendment is going to make it through the House this time.
Now, we'll see what happens IF that happens. Amazon took almost a decade to perfect being able to order a TV on a "millions of customers" scale. Can the gov't do it better?