Those that do not learn from History are doomed to repeat it. Forunatley I'd sure people would at least know of the Earthquake.
Plus, the Tower will likely not open again until there is a civilization that can surpass the Allagan Empire. By that point, it would either be redundant except as a power source or it will be studied so that this hypothetical civilisation can create backup plans so that it wouldn't be felled so easily to a mere earthquake (they cna also study What made Azys Lla the floating continent it is to that end, provided it dosen't require the Triad beyond powering the facilities there)