“Carlebach and other’s ‘ Hinei yomim boim neum Hashem v’hishlachti ro’ov bo’oretz lo ro’ov lalechem v’lo tsomo lamayim ki im lishmoa divrei Hashem’. This was one of the severest and harshest nevuas that there will be nobody who will be able to teach Torah (see meforshim there)”
im probably wrong because i never learned it inside, but i thought it meant that the hunger and thirst will be for EVERYONE to hear the words of Hashem- that the entire world will recognize Him.