The ACA would not die on its own.  It would die at the hands of an administration and Congress bent on destroying the law.  Big laws often require tweaks to make them work correctly.  People try to foresee all potential scenarios when a law is written, but they can't.  So over time, the law is modified to truly hit its purpose.  That hasn't been allowed to occur for the ACA and America is getting hurt because of it.  Likewise, until the law is actually repealed, it can't die on its own.  The executive branch would still need to enforce the law that is on the books.

I think the ACA was a flawed law, but Congress had the means to fix its flaws and chose to sit on their hands instead.