I thought this was going to be a thread about ways to change and improve the law (of which I think there are many), but a thread about ways to get it overturned (of which I think there are few that are likely to succeed).
But in the spirit of the OP, I suspect the easiest way to scrap the whole thing is for republicans to sweep the 2016 election. With the presidency and 60% of congress they could do any damn thing they please, including shooting immigrants on sight, dismantling every federal agency, and ending all social service programs including the ACA.