Just pointing this out, but you don't need dragonglass to put wights down. They can't reassemble. If you dismember them enough they won't be able to keep fighting. On top of that they are super vulnerable to being burned and Sauron is a walking furnace who's very touch can torch people.
Wights also can't put down Sauron or his Nazgul. Nor could the White Walkers, really. Nazgul just become disembodied spirits that can be re-equipped with a cloak and weapon by Sauron when their physical presence is destroyed, but nobody in the Night King's army can mess with their spirits or unbind the magic that keeps them tethered to the world. Even worse, the Witch King can use his magic to ignite his sword, making him a hard counter to white walkers who are vulnerable to fire magic (Valyrian steel and Dragonglass both damage them because of their close ties to the element of fire).
On top of that, Sauron's forces have actual tactics and far superior gear. The reason the dead overwhelmed the living at Winterfell is through sheer numbers, but Sauron arguably has a similar number of troops. If not far, far superior. The 100,000 number being tossed around is a fairly low estimate.
The Last Alliance is a really, really vague time for numbers. We can assume the Great Host of the Last Alliance had a minimum of 100,000ish troops in total because Tolkien by and large used specific terminology when describing army sizes, and that is what he generally meant when he called something a "great host". Since each race had its own host (20,000-50,000) or army (10,000 to 25,000 by Tolkien standards) the estimate in total numbers is anywhere between 100,000 and 140,000.
And Sauron's forces were supposed to be far greater than that. By how much we don't know, but it is already enough to greatly outnumber the dead.
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Individually wights are probably about as deadly as a standard orc, but you'd need dozens at least to threaten a troll and an oliphaunts could pretty much walk through them unopposed. With superior numbers the orcs should be able to out-flank the Army of the Dead and contain them. The dead don't raise themselves instantly, a white walker needs to be on the field to do that, and if they take the field they become vulnerable to the magic of the Witch King or Sauron.
Bare in mind, Sauron and the Witch King possesses long ranged telekinetic powers, can shatter the enemy's weapons in their hands, and conjure spells that inflict and control fear. The white walkers have no shown resistance to effects like this, and they visibly show emotion at multiple different points.
Interestingly, a part of the skill set of both Sauron and the Witch King, and presumably the other nazgul as well as Sauron had taught the nazgul, is necromancy. However Tolkien's necromancy is quite different from what the Night King does. Rather than just raising corpses they send corrupted spirits out that can then possess dead corpses and control them from the inside. These spirits are themselves fully autonomous and able to cast spells to some extent. We only ever really see them in Fellowship when the Hobbits find themselves in the Barrow-Downs, but it is a potential hard counter to the Night King's necromancy.
So all in all, the only real threat is the sheer number of white walkers. The wights, necromancy, and individual white walkers won't be a huge issue, and the Night King places his whole army at risk if he tries to fly in on Viserion. I don't see him defeating Sauron in combat either, and I don't see why Sauron wouldn't opt to try and break him personally if he notices how big a threat he is.
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