In The Name of Allaah, The Most Merciful, The Bestower of Mercy.

Allaah [The Most High] said: [إِن يَشَأْ يُذْهِبْكُمْ أَيُّهَا النَّاسُ وَيَأْتِ بِآخَرِينَ ۚ وَكَانَ اللَّهُ عَلَىٰ ذَٰلِكَ قَدِيرًا – If He wills, He can take you away, O people, and bring others. And Allah is Ever All-Potent over that]. [Surah An-Nisaa. Aayah 133]

Allaah is [ٱلْغني – (The Independent One Who is free from all need), ٱلْحميد – (The One Who is Deservedly Praised)], Who has absolute (or all encompassing) power over everything and everyone]. [إِن يَشَأْ يُذْهِبْكُمْ أَيُّهَا النَّاسُ وَيَأْتِ بِآخَرِينَ – If He wills, He can take you away, O people, and bring others] – those who will be more obedient to Allaah and better than you. This Aayah contains a severe threat against the people due to their disbelief and turning away from their Lord, for indeed Allaah is not burdened by them -in anyway- if they are not obedient to Him; rather He gives [them] respite and not that He is negligent [Free is He from all Imperfections, Faults, Deficiencies, Shortcomings, Co-equals, Partners]. (1)

Allaah [The Most High] stated at the time of the revelation of this Noble Ayah that if He wills, He can take away those who present and replace them with others. And He established this proof in other places [in the Qur’aan] that He did take away those before them and brought others as a replacement.

He [The Most High] said: [إِن يَشَأْ يُذْهِبْكُمْ وَيَسْتَخْلِفْ مِن بَعْدِكُم مَّا يَشَاءُ كَمَا أَنشَأَكُم مِّن ذُرِّيَّةِ قَوْمٍ آخَرِينَ – If He will, He can destroy you, and in your place make whom He will as your successors, as He raised you from the seed of other people].

And Allaah [The Most High] stated in another (place in the Qur’aan) that if they turn away, He can replace them with others and those other people will not be like those who have been replaced; rather they will be better than them. He [The Most High] said: [وَإِن تَتَوَلَّوْا يَسْتَبْدِلْ قَوْمًا غَيْرَكُمْ ثُمَّ لَا يَكُونُوا أَمْثَالَكُم – And if you turn away, He will exchange you for some other people, and they will not be your likes]. (2)

[Ref 1: Excerpt from Tayseer Al-Kareem Ar-Rahmaan Fee Tafseer Kalaam Al-Mannaan]
[Ref 2: An Excerpt from Adwaa’il Bayaan by Imam Ash-Shanqeetee]