That's assuming the holy city refers to a physical city.
And what happens when the salt loses it's Savour, is it not
trodden under foot of men?
Isaiah 51:16-17 "And I have put my words in thy mouth, and I have covered thee in the shadow of mine hand, that I may plant the heavens, and lay the foundations of the earth,
and say unto Zion, Thou art my people.[SUP]
17 [/SUP]Awake, awake, stand up,
O Jerusalem, which hast drunk at the hand of the Lord the cup of his fury; thou hast drunken the dregs of the cup of trembling, and wrung them out."
Isaiah 52:1-2 "Awake, awake; put on thy strength,
O Zion; put on thy beautiful garments,
O Jerusalem, the holy city: for henceforth there shall no more come into thee the uncircumcised and the unclean.
[SUP]
2 [/SUP]Shake thyself from the dust; arise, and sit down,
O Jerusalem: loose thyself from the bands of thy neck, O captive daughter of Zion."
Isaiah 62:11-12 "Behold, the Lord hath proclaimed unto the end of the world, Say ye to the daughter of Zion, Behold, thy salvation cometh; behold, his reward is with him, and his work before him.
[SUP]
12 [/SUP]And they shall call them,
The holy people, The redeemed of the Lord: and thou shalt be called, Sought out,
A city not forsaken."