Moses wanted God to be merciful to all the people[/QUOTE]
Moses acts out of love because God loved us first. Moses wants mercy because God wanted mercy first.
1 John 4:19 We love because he first loved us.
Thus, it has always been The Lord's plan to save all people. Universal Salvation has been true since the very beginning.
1 Thessalonians 4:9 Now concerning brotherly love you have no need for anyone to write to you, for you yourselves have been taught by God to love one another,