We have to remember the potential cultural impact of the divine spellcasters from other spheres in the Krynnsphere in the age between the cataclysm and the return of the dragons, the war of the lance. Not only sorcerers and warlocks practically the psionic manifester classes aren't wellcome in Krynn, and we don't know the new classes with own game mechanics from 3.5 Ed and later, for example the crusader or the (incarnum soulmelder) Totemist Shaman.
* My fear is players from new generations using Dark Sun as a rip-off of Gor.