Even so, the US Greens are a microscopic political movement in the US (I say this as a former member). As usual I think Norm is right here. There is simply no mainstream political support for a one-state solution. To demand it is just to engage is sloganeering. Personally I think it makes a lot of sense but I know that it won’t ever happen in the current political climate.
Even if in some fantasy the world agreed on it I think Israel would rather commit suicide than allow it to happen (they would view it as basically the same).