Rather than say Hilly will scrap Obamacare & institute single payer (which she will), I think it is more effective for Trump to say that with Hilly as President & having the ‘veto pen’, there is NO way for Obamacare to be repealed and replaced. The sheeple will accept single payer & some (Left/Progs/Dems) will like it a lot & want it to happen .... very few like Obamacare when the rates are gob-smacking them in the face, & getting RID of Obamacare, including the hated mandate that fines you for not buying something you cannot afford or does not making economic sense to afford, is what most would like to see. Put Hilly front and center as obstructing replace/repeal & I think most folks can ‘get that’ in a hurry.
One of Illary’s suggestions is to let 50 year old’s that can’t afford insurance to start using Medicare. Insurance companies probably love that idea since 50 is about the age people start having big medical bills.