He wasn't calling it Obamacare, he was referring to the bill it's related to. It's hilarious because the dominant majority of problems with the ACA were personally put the by Republicans.
What problems did the republicans put into the ACA? I watched c-span as it was put into committee, I didn't see anything put in that republicans requested at that point. During the mockery of a "roundtable" that Obama held that was televised they shot down every republican idea. Unless you mean that they used an outline of an old republican idea to help form the ACA from I think it was the 90's.
I vaguely remember it used to be a lot longer and cover more but the Republicans kept complaining and wanted things to get cut when they were still in the process of hashing it out.
That could very well be true but since the democrats had both houses they didn't really care. Watching the committees at work was like watching kids fighting in a sandbox, it was horrible on both sides.
One thing I am pretty sure about is that if the medicaid stops for the 10 million or so Americans don't expect a republican controlled house and senate for long.