The Republicans were lying about death panels before - dropping the end of life planning provisions won't stop them from lying about it again. Lies, and liars, need to be destroyed, stood up to, so they realize it's just not worth lying again. We're talking about people who lie. Changing the fact pattern won't stop them from lying. That's kind of the point.
GOP [to a very skinny Democrat]: You're fat.
Dem: No I'm not. But I'll go lose ten pounds, then you'll stop lying about my weight.
GOP [to a now even skinnier Democrat]: You're fat.