That seems unlikely to me. Much of Trump's platform was about disliking everything Democrats do. It's hard for me to imagine that any single policy change by th

That seems unlikely to me. Much of Trump's platform was about disliking everything Democrats do. It's hard for me to imagine that any single policy change by the Democrats would attract a significant fraction of Trump voters. Further, "states' rights" always seems to be a code for "things that I cannot control at a national level but at least want to manage at a level I can control". For example, a Democrat running on a strict states-rights level might say "New York and California should be allowed to require firearms registration", and I don't see that attracting a single Republican voter, but that's one consequence of truly devolving control to the states. (It is a perfectly valid reading of the second amendment to require registration, just as very few people have trouble reading the second amendment to restrict felons from gun ownership.) So I see "states' rights" as a talking point rather than a serious policy proposal. Most of those who claim to support it seem perfectly willing to federally regulate matters that are important to them.