Obviously, it is self-evident, that it was a rebuke of their UNbelief. The 12 plus the 70 were granted multiple gifts as demonstrations that the Kingdom of God was "at hand."
Paul was not the 13th Apostle. He inherited nothing from them insofar as salvation by grace thru faith is concerned. The 12+70 knew nothing of the mystery, the secret hid in Christ and not revealed until after Acts 9, the Damascus Road experience of Paul. See Romans 16:25-27. Now move beyond 1 Corinthians 12:7, to 1 Corinthians 13:8-10. What does Paul write? During the transition from law to grace those gifts heralded the Messianic Kingdom of God. There were no Christian scriptures at that point. Once the promised Messianic Kingdom was placed on hold, the "gifts" faded away and were gone completely by the destruction of Jerusalem.
After Jesus' ascension miracles were evident. Acts 6 thru 8 record some of those. It didn't last. You can read 2 Corinthians 12:5-10, 1 Timothy 5:23, 2 Timothy 4:20, and Collisians 4:14 for examples.
Undoubtedly, God can do anything He wants to do. He is not now engaged in promises of an earthly Kingdom such as the Messianic Kingdom of God on earth, with Jesus on the Throne of David. Nothing even resembling that. He is now issuing his final warnings for all the nations that have gone astray. The Rapture looms large, not miracles and signs and wonders and healing.
Millions of people around the world have been misled by the heretical "ministries" of Benny Hinn, Kenneth & Gloria Copeland, Charles Capps, Mike Murdock, and a score of others on national TV and in their huge arenas. Today we need to minister the Truth of John 14:6, John 3:16-17, John 3:3, Romans 10:8-13, Ephesians 2:8-9, and a score of other spiritually comprehended scriptures which point to far more than faith healings, God sending money, homes, cars, prophets and prophetesses, and other gurus and their prattle; rather, to God's Amazing Grace: Life eternal.
Not sure why you think those passages are evidence that miracles no longer happen. After all in Jesus Christ Himself we see the lesson that having all the power and authority in the universe does not equate to total freedom from suffering and even death. The power of the Holy Spirit is not about personal wish fulfilment or physical well being as you pointed out, but about fulfilment of the will and purposes of the Lord. Which is why the fact somebody gets sick or dies is not evidence miracles no longer happen.
As to the "Messianic Kingdom of God" you might want to check out my Youtube video "Reality Bender 06: Hidden In The Dark" (Part1)" and "Reality Bender 06: Hidden In The Dark" (Part2)" . You may be surprised just how alive and well miracles and fulfilment of prophecy are.
But as to the last part it whilst there is indeed much false teaching about miracles it only makes it more imperative to properly understand the nature of the power and strength we have in Christ. Whilst a solid foundation to our faith and undersgtanding is essential we must not neglect the command to also GROW in our understanding, knowledge and faith. We cannot simply stop at a selected few passages and think we have done all we need to. Remember these passages:-
Eph 4:15 But speaking the truth in love, may grow up into him in all things, which is the head, even Christ:
1Pe 2:2 As newborn babes, desire the sincere milk of the word, that ye may grow thereby:
2Pe 3:18 But grow in grace, and in the knowledge of our Lord and Saviour Jesus Christ.
Heb 5:11 Of whom we have many things to say, and hard to be uttered, seeing ye are dull of hearing. 12 For when for the time ye ought to be teachers, ye have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of strong meat. 13 For every one that useth milk is unskilful in the word of righteousness: for he is a babe. 14 But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.
1 Therefore leaving the principles of the doctrine of Christ, let us go on unto perfection; not laying again the foundation of repentance from dead works, and of faith toward God,
2 Tim 3:16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: 17 That the man of God may be perfect, throughly furnished unto all good works.