Atlantis, it seems, has became a title given to any submerged evidence of civilization that may have existed in the window of 5-10 thousand years ago. I think what will be confirmed is that mankind worldwide had fairly robust civilizations in many parts of the world at the end of the last ice age. I think that there is a high likelyhood that Atlantis in some form or another did exist but as of yet it has not been found in any definitive sense and it will probably be some time before it is.
If the temperate zones were where they are today--or even farther from the equator, the evidence has been largely buried or wiped out.
What we find today is mainly the remnants of equatorial civilizations, when those climates were more temperate and the remanants of the ice sheets were retreating, those remnants now are largely in desert or tropical climate regions because the climate changed when the ice sheets receeded.
Just my crackpot ideas...