If the US rhetoric continues it will not be long until you will see some currently non-nuclear EU countries start talking about contingency options. It will take a while, but it is good to remember that the reason there are so few nuclear weapons states is not because it is terribly hard, but because states have abstained for the global good and benefit of non-proliferation. This with the implied protection from states that have it.
If that no longer holds, then we enter a new era where non-proliferation will be history.