Hmmm? When the Old Covenant prophets, and the New Covenant apostles speak of the coming of Christ, weren't they speaking of His first coming in flesh, and His coming again in flesh in the same manner in which He was seen departing? In a sense I would agree that Christ does come, when He enters into believers through the Holy Spirit, but we only read of Him physically coming, first advent, and His second coming again after the seventh trumpet sounds.
Hebrews 9:28 (KJV) So Christ was once offered to bear the sins of many; and unto them that look for him shall he appear the second time without sin unto salvation.
In reading this passage from John, it does seem like Christ is telling us that He will return to always be with and in believers through His Spirit. It's very comforting to know that Christ is with us always through His Spirit in us, however, I don't view Christ sending His Spirit as the second coming of Christ physically as He has promised He shall.
John 14:16-20 (KJV) And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever; Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you. I will not leave you comfortless: I will come to you. Yet a little while, and the world seeth me no more; but ye see me: because I live, ye shall live also. At that day ye shall know that I am in my Father, and ye in me, and I in you.
For now we see Christ spiritually through His Holy Spirit in us, but when He comes again we shall physically see and know Him, and we shall be like Him.
1 John 3:2 (KJV) Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is.
1 Corinthians 13:10 (KJV) But when that which is perfect is come, then that which is in part shall be done away.
1 Corinthians 13:12 (KJV) For now we see through a glass, darkly; but then face to face: now I know in part; but then shall I know even as also I am known.