Perhaps a significant part of the mission of the Apostles (“going through the towns of Israel before the coming of the son of man”) was to recruit further people away from the militant nationalist tendencies that were leading the nation toward disaster (“unless you repent, you will likewise perish”; Lk 13:1-3).
If that was a significant part of the mission, it’s not clear to me that they failed (though the “success”, such as it was, was much smaller than one would have preferred). Faith remained “in the land” at the time of the coming of the son of man. The church fled Jerusalem at the approach of the armies of Rome and so escaped the calamity. Evidently the “readers” of the written traditions of Jesus’ warnings did indeed “understand”.
I have read that Jewish Jesus-followers in the land were not treated well by their countrymen in the run-up to and the actual event of the second war (132-135); evidently the memory of their non-participation in the first war was regarded as evidence of disloyalty to the people or the religion.
If Jesus’ followers among Israel were still pursuing a “way of peace” a hundred years after his death, in spite of ongoing persecution, that looks pretty good to me. Was it a “failure” or are our expectations of what “success” ought to have been unreasonable?