If you want all countries to give up their nukes then I would agree with that. Perhaps the US could theoretically achieve a world without nukes if they threatened sanctions against countries who keep nukes.

But in reality, if the UK gives up its nukes, no other country will do so. I think Europe should possess nukes for the foreseeable future. Like I said before, if Europe dismantles its nukes, all it would mean is that the US, China, and Russia would suddenly have a lot of leverage over Europe.