Noach: The Tower of Bavel and the Development of Languages

A short narrative in Bereishit 11:

א וַיְהִי כָל-הָאָרֶץ, שָׂפָה אֶחָת, וּדְבָרִים, אֲחָדִים.	1 And the whole earth was of one language and of one speech.
ב וַיְהִי, בְּנָסְעָם מִקֶּדֶם; וַיִּמְצְאוּ בִקְעָה בְּאֶרֶץ שִׁנְעָר, וַיֵּשְׁבוּ שָׁם.	2 And it came to pass, as they journeyed east, that they found a plain in the land of Shinar; and they dwelt there.
ג וַיֹּאמְרוּ אִישׁ אֶל-רֵעֵהוּ, הָבָה נִלְבְּנָה לְבֵנִים, וְנִשְׂרְפָה, לִשְׂרֵפָה; וַתְּהִי לָהֶם הַלְּבֵנָה, לְאָבֶן, וְהַחֵמָר, הָיָה לָהֶם לַחֹמֶר.	3 And they said one to another: 'Come, let us make brick, and burn them thoroughly.' And they had brick for stone, and slime had they for mortar.
ד וַיֹּאמְרוּ הָבָה נִבְנֶה-לָּנוּ עִיר, וּמִגְדָּל וְרֹאשׁוֹ בַשָּׁמַיִם, וְנַעֲשֶׂה-לָּנוּ, שֵׁם: פֶּן-נָפוּץ, עַל-פְּנֵי כָל-הָאָרֶץ.	4 And they said: 'Come, let us build us a city, and a tower, with its top in heaven, and let us make us a name; lest we be scattered abroad upon the face of the whole earth.'
ה וַיֵּרֶד ה, לִרְאֹת אֶת-הָעִיר וְאֶת-הַמִּגְדָּל, אֲשֶׁר בָּנוּ, בְּנֵי הָאָדָם.	5 And the LORD came down to see the city and the tower, which the children of men builded.
ו וַיֹּאמֶר ה, הֵן עַם אֶחָד וְשָׂפָה אַחַת לְכֻלָּם, וְזֶה, הַחִלָּם לַעֲשׂוֹת; וְעַתָּה לֹא-יִבָּצֵר מֵהֶם, כֹּל אֲשֶׁר יָזְמוּ לַעֲשׂוֹת.	6 And the LORD said: 'Behold, they are one people, and they have all one language; and this is what they begin to do; and now nothing will be withholden from them, which they purpose to do.
ז הָבָה, נֵרְדָה, וְנָבְלָה שָׁם, שְׂפָתָם--אֲשֶׁר לֹא יִשְׁמְעוּ, אִישׁ שְׂפַת רֵעֵהוּ.	7 Come, let us go down, and there confound their language, that they may not understand one another's speech.'
ח וַיָּפֶץ ה אֹתָם מִשָּׁם, עַל-פְּנֵי כָל-הָאָרֶץ; וַיַּחְדְּלוּ, לִבְנֹת הָעִיר.	8 So the LORD scattered them abroad from thence upon the face of all the earth; and they left off to build the city.
ט עַל-כֵּן קָרָא שְׁמָהּ, בָּבֶל, כִּי-שָׁם בָּלַל ה, שְׂפַת כָּל-הָאָרֶץ; וּמִשָּׁם הֱפִיצָם ה, עַל-פְּנֵי כָּל-הָאָרֶץ. {פ}	9 Therefore was the name of it called Babel; because the LORD did there confound the language of all the earth; and from thence did the LORD scatter them abroad upon the face of all the earth. {P}

Is this how languages came about? Via miracle? Initially, everyone spoke a single language, but then, suddenly, God confounded their languages and they could not understand one another?

Ibn Ezra reads this differently. After all, Hashem says in pasuk 7 that he will confound their language. But, we see no mention of this action in pasuk 8. Rather, Hashem dispersed them. Then, as they were ruled over by different kings after Nimrod, and dispersed over various countries, their languages naturally deviated and developed. Pasuk 9 says how Hashem confounded the speech, by spreading them over the face of the earth.

Modern linguistic theory believes in language families, and draws a nice family tree of languages as they develop, one in accord with this basic idea.