@cicerone imposter,
More than that the President feels free to amend it anytime he chooses.
I believe another Supreme Court challenge will arise over the subsidizing of policies in the ACA Federal exchanges - something that is clearly not authorized in the law, but allowed by the President. How that may turn out I don't know, but the law isn't as secure as you imply in that area.
In addition I believe the Republicans will work on defunding and amending the law in segments. I suspect that, if they choose their targets wisely, we will start seeing some Democrat defectors. Harry Reid prohibited nearly all votes on legislation, thereby protecting Democrat Senators from going on record before the recent election in votes on contentious issues. While doing so he had the duplicity to blame Republicans for the resulting deadlock. An even higher stakes election is just two years out, and that protection is now gone. Beteween that and the President's falling popularity, and increasingly obvious tin ear for public perceptions, I believe we will soon start seeing a lot more division in the Democrat ranks.
I wouldn't bet the ranch on this "Law of the Land".