Will all the festivals in the future indeed be annulled?

Hello and blessings

Bnei Yissaschar, Maamarei Chodesh Adar, Maamar 4 - The Days of Purim

8) The Sages told us, based on their tradition [Yalkut Shimoni, Mishlei 944], that if all the festivals are to be nullified, the days of Purim will not be nullified. It is certainly proper to understand how it could be imagined that all the festivals would be nullified, for we hold that Hashem will not change or alter His law. And even if it could be imagined that the festivals would be nullified, it is proper to reflect on why the stature of the days of Purim would be greater, such that they would not be nullified. It appears to me, in my humble opinion, that our Sages said regarding the verse, No longer shall it be said, As Hashem lives, who brought up the children of Israel from the land of Egypt, but rather, etc. [Jeremiah 16:14], and they expounded that this does not mean that the Exodus from Egypt will be uprooted from its place, rather that subjugation to the kingdoms will be primary and the Exodus from Egypt secondary [Berachot 12b]. Now the verse proclaims, No longer shall it be said, etc., and we must say that the account of the Exodus from Egypt will not be noticeable in comparison with the account of the miracles of the subjugation to the kingdoms, and this is like something that is nullified in sixty or in a hundred, which is as though it never was, and even the prohibition is nullified and returns to permissibility. Therefore it is called, No longer shall it be said, meaning that it will be as though it is not said, in the sense of nullification in sixty or in a hundred, and a thousand, and the like. Now all the festivals are a remembrance of the Exodus from Egypt, and they will be nullified in the days of the Messiah, meaning that the miracles of the future will become so great that the miracles of the festivals, which are a remembrance of the Exodus from Egypt, will be nullified within the account of the future in sixty or in a hundred, and a thousand, and the like. But the miracles of the days of Purim are from the matter of the annihilation of Amalek, and upon this the future redemption depends. Thus they are of the same nature as the future redemption, when the Name and the Throne will be complete, may it be speedily in our days, amen. Therefore these days of Purim will not have nullification in sixty or the like, for the remembrance of these days is itself like the days of the final redemption, when the offspring of Amalek will be blotted out speedily in our days, amen.

With blessings,

Binyamin Shmueli