Nobody is saying Jesus won't literally appear a second time, future to us.
The signs Jesus speaks of in Matt 24 are very real. However, the signs in the sky you are looking for are symbolic, and meant to convey the despair that accompanies God's judgment. Students of the Old Testament will notice these symbols of judgment have already been experienced by Belshazzar's Babylon (Isa 13 & Dan 5) and were prophesied by Joel to come upon those who cling to the old Mosaic covenant (Joe 2).
Scripture provides us with the other side to this symbolic language for those rescued by God.
Isa 30:26 - Moreover the light of the moon shall be as the light of the sun, and the light of the sun shall be sevenfold, as the light of seven days, in the day that the LORD bindeth up the breach of his people, and healeth the stroke of their wound.
Challenge your assumptions.
Thanks for that scripture reference
Sinthesis. In going back to look at the rest of the scripture from Isaiah 30, it is especially interesting to note that the "breach" was created because they took counsel, but not of God, and they covered themselves, but not with His Spirit.
Isaiah 30:1-3
Woe to the rebellious children, saith the Lord,
that take counsel, but not of me;
and that cover with a covering, but not of my spirit,
that they may add sin to sin:
That walk to go down into Egypt,
and have not asked at my mouth;
to strengthen themselves in the strength of Pharaoh,
and to trust in the shadow of Egypt!
Therefore shall the strength of Pharaoh be your shame,
and the trust in the shadow of Egypt your confusion.
They trusted in the counsel of Moses. They covered themselves with the covenant of Law, and did trust in its shadow, yet never took counsel of God, nor allow themselves to be covered with His Spirit. But the breach has been closed and the wounds healed in Christ. He hath fulfilled the promise of God as He has sent forth the Holy Spirit to come and make his abode within our heart. This was the promise of his coming, that he would send forth his Spirit: this was seen and witnessed and testified of on the day of Pentecost.
How many today remain as the rebellious children, trusting to the counsel of their Bibles, but not the counsel that comes from the Lord. Covering themselves in the sacrificial blood to blot out their sins, rather than covering themselves with the Spirit and the Grace that come therewith. They trust in the counsel of their Bible, but to their own confusion and shame, for without the Spirit of the Lord to guide you, they are idle words in the page of a book.
For anyone who remains so focused on a physical second coming sometime in the future, have you actually taken the time to learn of the significance concerning the promise of Jesus when he said he would send forth the Comforter? If you are so focused on what you believe to be one singular future event, do you ever take the time to try and understand your relationship to the Lord in this present moment?
The Scripture says that the Just shall live by Faith. Jesus said take no thought for tomorrow. Be careful that your assumptions about a future, or your beliefs about the past for that matter do not become a blinder and a hindrance to communion with Lord through His Spirit at this very present moment. But as it is written in the scripture, some live by the temple, while others wait at the altar (1 Cor 9:13).