The courts could do something, but then Congress could either override or impeach them. The Supreme Court shouldn't be the tool to use for this, the legislature is the right path.

As most things go, it's generally easier to get things done in your local state and then get them done federally later. So if you want action now, work with your city, county, and state. Once you have a proven legal framework, work with other states to get it passed, and then work with Congress. Marijuana legalization is a great example of this, and I think we'll see marijuana get legalized or at least rescheduled in the coming years. Healthcare is another good example, where something like the ACA was tried in various states before it got traction at the federal level.

So if you want to effect national change, start at the local level.