Will the iphone 7 and 7 plus go down in price even more on the 3rd of November when the iphone X comes out?

Will the iphone 7 and 7 plus go down in price even more on the 3rd of November when the iphone X comes out?

Nope.

More than likely (if it follows the same pattern for two gen gaps from Apple) the scenario is that they'll stop selling them.