Luke 16:31 (NKJV): 31 But he said to him, ‘If they do not hear Moses and the prophets, neither will they be persuaded though one rise from the dead.’ ”
The real truth is, is that we already had not just Jesus, but many followers of his, doing all kinds of miracles and healings (and signs and wonders and deliverances) back then. And what was it's effect then, etc? Because the real truth is, is that none of the miracles and healings (and deliverances and signs and wonders) never really did anything back then, etc. Not in a way that would stand the test of time anyway. And also, the miracles and healings (and signs and wonders) were not really the point even, even way back then really, etc.
He did not say that the effect that the miracles and healings (and signs and wonders) had on people would not pass away (because he knew they would) but that it would only be his teaching that would have and everlasting effect permanently, etc. So focusing too much on them, causes you to be missing the point entirely, etc. What was most important was his teaching, etc. And regardless of whether anyone would heed it or not, it would still always and eternally be always right forever, and would/will outlast everything, etc. Even this whole entire creations being completely done away with, and/or passing away, or completely ending, etc. But the effect of the signs, or that the signs have, always passes away. And it usually only takes a couple of generations at that, before the effect of them passes away, etc. Which is nothing compared to a teaching that will stand/last for all eternity, etc.
And all those people that were healed or whatever in this way, could not only very easily be undone again, but death itself still catches up with everyone eventually, so it was really not at all about any of the signs or wonders really, but they were all pretty much unimportant, and might have even been done flippantly, but were most definitely secondary, and maybe even very much more less than secondary, etc.
People always like to say they'd believe if they saw anything like that easily, but that is not even anywhere close to the real truth really, etc, and God and Jesus knew/already knows this already. I know you may not believe in a book like Judges, because too many generations have now passed for that really, but how many times did God in the OT keep on supernaturally delivering them over and over and over again continually? They would start out delivered/fully believing in and following God, and walking in His ways, but then after just one or two generations, would get themselves back into trouble again (disobedience/sin) and have to see signs and wonders and/or be supernaturally delivered again, and then over and over and over again continually, etc.
So you see, signs and wonders are never a permanent solution, but the only thing that ever stood a chance like that, would only be some very, very revolutionary moral and behavioral teaching, etc.
I think God in the OT/Holy Spirit in the NT, is only where this kind of power can ever come from completely, and maybe after what he tried to do in the OT, and then later on with Jesus, maybe after Jesus, it really all was 100% genuinely and truly "finished" completely, and after that, God that was in the OT, and is the Holy Spirit in the NT, no longer saw a very good reason to maybe do or perform them anymore after that maybe, etc. What Jesus did, completely defeated the Holy Spirit's enemy the Devil (Satan), and conquered sin and death once and for all and forever, but would just need to take some time to come to it's full fulfillment, etc. But God the Spirit "saw it" after what Jesus did finally, whereas He couldn't fully see it before, but now that He could now "see it", etc, it means is was for sure 100% successful, 100% completely.
So we are "post" all of that now, the signs and wonders stage I mean maybe. And do to God's perspective on it now, and maybe everything now, maybe He just isn't in the business of doing them like He once was now anymore completely, etc.
We saw what happened back then with the world and with all of this/these being done for sure, etc, and a bunch of them, and a bunch of different kinds of ones, everything that was undeniably impossible, right in front of their face, etc, and how did the world react back then? Well, they crucified our Risen Lord, etc. So do you really think it would ever be any different today? Cause it wouldn't. It was tried a bunch of different times long, long before Jesus already, and it never proved successful, or even ever very lasting, 100% of the time, 100% completely.
Now, some say that we might see things like this get resurrected right before the very end of the 6th day someday, and we might see some of that maybe, etc. But just don't ever expect the world to ever repent, or ever truly change because of it ever completely. Because our book says most of them won't, etc, but will just rally at or against God, and/or get angry, etc.
Most of your's mistake, is in thinking the world is in any way different today.
God Bless.