Disruption does not equal elimination. Knowing a line to Aaron is not the same as knowing all who are in the line of Levi. And yes, there has been a reestablishment, a “settling” over the question of lines, which is different than having the documents in hand proving it beyond question.
The point I was trying to make was that not only was the Temple building destroyed, but the priesthood at that time was thrown into such disarray that no one who managed to survive the Roman attack in 70AD was sure who was legitimately a priest or not. This is to point out that it wasn’t just as simple a matter as building another Temple there or elsewhere. Now, having centuries to recover, there is some certainty about who is who, but it’s not 100%. I didn’t mean that to imply that today, were the Jews to rebuild a temple, they would have no one to staff it. I only meant that had they rebuilt it in 71AD, they wouldn’t have. I would assume had they done so, they would have held some sort of Rabbinical Council or something to settle the matter.