Anon1m0us, the Amoraim lived after Churban Bais Sheni. The Amoraim in Kesubos 111 applied the oaths to their generation.
UJM, in case you were serious, here is my point in other words. As per the Maharal, the oaths are means of keeping the Galus in place. The Galus is not something we were told to go into. We were taken. And, these Shvuos were set in place to keep the Galus. We were warned that if we try to force things it won’t work and it will turn out bad.
However, in the case of the state of Israel, when if the original groups agitated for and hoped for mass migration, it didn’t happen that way. The Jews of Europe didn’t just get up and go. And the fact that the state succeeded in being established, for quite a few decades now, is proof that this is not a violation of Olah Bechomah or Meridah Ba’umos. Because again, those Gezeiros meant that it can’t work.
Moreover, even if someone violated the oath and got punished, that’s the system at play, but it doesn’t make him the worst Kofer. Doesn’t the Gemara in Shabbos call Tzlafchad a Tzadik while considering him as one of the Mapilim?