Lela there a is whole Congress, 535 members whose job it is to focus on legislation, they  can and have tweaked everything else for over 200 years. . They seem tweak things it a lot. The ACA is no different than any other legislation where congress removes words, phrases, paragraphs or section. Some time to add and sometime they just remove.  It has been done for over 200 years; so I'd say they have the knowledge to take care of this. The question is do they have the desire to risk loosing a vote here and there.