Languages are evolution of communication in human beings in various regions of planet earth in thoudands of years but you are making arabic as coming directly from heaven or Allah's liking or limitations.
Beside past, there is future too, unknown.
All Arabs now speak English, but all English do not speak arabic.
Arabic is becoming most unpopular language due Arabs and Muslim behaviour and their reputation.
Pakistan, Indonesia or Iran are Muslim countries, but how many want to speak in arabic with each other, beside few Quran reciters without even u/standing one word.
Plz give us a break.