Could Númenor Have Been Redeemed?

[Inziladun]

The Fall of Númenor, I think, had its roots in two things: the nearness of the land itself to the Undying Lands in the West, giving the Edain who dwelt there a constant reminder that they had not the life of the Eldar; and the very bliss of the Númenóreans' lives: the more joy they had, the more they wanted.
Now Sauron, when threatened by them in his goal to conquer Middle-earth, determined that he could not defeat them militarily. His best hope was to get near Ar-Pharazôn, the King, and exercise his guile and superior will. He managed to do so, eventually ruling Númenor in all but name.
Númenor was destroyed, as we know, when the Númenóreans were influenced by Sauron to attack Valinor in a vain attempt to wrest immortality away from the Valar.
The seeds of its destruction were already well in place before Sauron set foot on the isle. However, it needed his evil deceits and control of the King to set into motion the events that led to the Downfall.
The question is, could the Dúnedain have found wisdom again, and backed away from their perilous course, if they had not brought Sauron to the island? Tar-Palantir, Pharazôn's predecessor, tried to turn things around on his own. Were there enough of the Faithful left on the island to have brought about change? Amandil, father of Elendil, was said to be a close friend of Ar-Pharazôn even though they were of different minds regarding the Elves. Without Sauron, could things have ultimately turned out differently for Númenor?