If you are left on earth after the rapture, does it really even matter what happens then?
No one will be in Heaven from Earth except they come through The Lamb, Son of The Living God. A clue to the tremendous variety and number is who is listed at the marriage feast, since the Bride is already accounted for.
I’ve heard it said that ‘during the Church Age we come to Jesus by faith in God’s Promises; after the Rapture people will come to Jesus out of fear for what is coming on the Earth.’
[does it really even matter what happens then?]
Yes. Yes, it matters greatly.
Those who refuse the Mark of the Beast are martyred as Tribulation Saints.
Those who accept the Mark of the Beast are tormented with fire and brimstone for ever and ever.
Let the nonbeliever now laugh at the “fire and brimstone” they’ve mocked in times past. They will not laugh forever. Here is wisdom. Today is the day of Salvation.
Revelation 14:9-11 King James Version (KJV)
9 And the third angel followed them, saying with a loud voice, If any man worship the beast and his image, and receive his mark in his forehead, or in his hand,
10 The same shall drink of the wine of the wrath of God, which is poured out without mixture into the cup of his indignation; and he shall be tormented with fire and brimstone in the presence of the holy angels, and in the presence of the Lamb:
11 And the smoke of their torment ascendeth up for ever and ever: and they have no rest day nor night, who worship the beast and his image, and whosoever receiveth the mark of his name.
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Revelation 13:16-18 King James Version (KJV)
16 And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads:
17 And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name.
18 Here is wisdom. Let him that hath understanding count the number of the beast: for it is the number of a man; and his number is Six hundred threescore and six