Well, you can't expect the rest of the world to sit on their hands waiting for US socialists to get their act together. I'm not saying that you can't build a strong socialist movement in the US before dismantling Empire (in fact I would welcome it since it'll likely make it easier for all anti-imperialists), it's just from what I've observed of the state of the left in the country, I think it's unlikely to happen. It's up to US comrades ultimately if the country gets taken over by right wing populists.