I'm a big fan of the idea of abolishing states, having a US national government and then county/city level governments. The states were created when it was infeasible to manage large amounts of territory due to the difficulty of communicating across long distances. That's no longer the case. We could cede some state powers to local governments and some to the federal level.

The idea would get pushback from those in smaller states who enjoy a disproportionate voice in national politics, but I feel that those voices don't deserve to be amplified over anyone else's just because they have a bunch of empty land backing them.