They only speak and understand Yiddish and Hungarian.They will have to leave because according to the Holy Rebbe R' Yoel, Ivrit is a "Tumedik" language, and I understand that Rav Finkel and Rav Shmuelevitz cannot understand or speak Hungarian.
Satmar & other Chasidishe Yeshivos speak neither Yiddish or English ...
Their Yiddish vocabulary is a meager 200 word vocabulary. Like when they want to buy soup they say
"ge'mmir a zip"
But if the Chassidishe Yeshivas taught in Hebrew the bochrum would have had and easier time learning.
When you study Torah in Hebrew, it becomes natural & ingrained.
The average Israeli elementary yeshiva student knows much more than
the average High School Yeshiva student ...
Now let's see what the Torah Ha'Kdoshe says about the Hebrew language....
[And you shall teach them to your sons,] to speak with them: From the
moment your son knows how to speak, teach him, “Moses commanded us the
Torah” (Deut. 33:4). Let him learn speech through this (Sukkah 42a).
From this, our Rabbis taught: When the infant begins to talk, his
father should speak to him in the Holy Tongue, and should teach him
the Torah. If he does not do this, it is as though he buries him, as
it is stated [here], “And you shall teach them to your sons to speak
with them…” [in order that your days may increase, and the days of
לדבר בם: משעה שהבן יודע לדבר, למדהו תורה צוה לנו משה (דב' לג ד), שיהא
זה למוד דבורו. מכאן אמרו, כשהתינוק מתחיל לדבר אביו מסיח עמו בלשון הקדש
ומלמדו תורה, ואם לא עשה כן הרי הוא כאלו קוברו, שנאמר ולמדתם אותם את
בניכם לדבר בם וגו':
Hundreds of talmidim at Mir Yerushalayim were surprised on Monday morning 13 Adar I when the Rosh Yeshiva HaGaon HaRav Eliezer Yehuda Finkel gave his ‘shiur klalli’ in Hebrew instead of Yiddish, with Yiddish having been the norm for many years.
Kikar Shabbos reports that just days ago, in his shiur, HaGaon HaRav Yaakov Shmuelevitz gave his shiur in Hebrew instead of Yiddish.
Rav Shmuelevitz recently assumed the post of his late father, HaGaon HaRav Refoel Shmuelevitz ZT”L, who was niftar a few weeks ago.
Talmidim explain the Rosh Yeshiva spoke in Hebrew to avoid having some shiurim in Yiddish and some in Hebrew, hence, he decided to follow the lead of Rabbi Shmuelevitz.
They further explain the rabbonim understand not all the Israeli talmidim understand the Yiddish, leading to the decision to change to Hebrew to permit everyone to understand. They explain it is better to abandon the long-standing minhag towards everyone understanding a sugya.