The way i see it based of azeroth is that outside of certain areas their is very little evidence of titans IE; Uldum Ulduar, Uldaman and stormpeaks and such. that being said when only say.... about 10-20% of the world shows evidence of titans why ins'nt it too unlikely its no on draenor anymore for all we know whats left may only be an incredibly small portion of the original planet, is it also possible that their many be other remnants of draenor out there?

For another mater the lack of titan relics may mean this was a perfect world where everyone was going according to plan before the draenei came and brought the burning legion with them. the amount of titan influence on azeroth cant really be compared to other planets because of its special issues the, only real way to tell is to see another planet that was visited by the titans and was successful, my idea is that is what draenor could have been before everything went wrong.

then again im also insane >-> my ideas are outside the box around the corner and hanging out in a back ally behind a Denney's