Originally Posted by ARM3481

Silithus also had the baggage of being a level 55-60 zone in a day and age when most people on alts seem to just head straight to Outland as soon as possible. Lowering its level would have taken a midpoint in the leveling curve and jammed it into a dead-end corner of Kalimdor, while revamping it as a level 55-60 zone again would have resulted in the same situation of Kalimdor being geographically removed from the Azeroth-to-Outland transition that has people favoring the Blasted Lands anyway due to the convenience of the Dark Portal letting them jump straight into Hellfire right away.

Silithus is extremely isolated, which makes it clunkier to finish leveling in Kalimdor because it means finishing up the 55-60 (or 55-56/57) stretch just about as far away from the next leveling stretch as one can be, and with no city nearby to offer fast transport. The Horde at least has Booty Bay to get to the Blasted Lands; the nearest faction-shared point of transit to Silithus' corner of the world is Ratchet, which is still quite a ways away.

I'd personally find it cool to visit again and learn more about Silithus, but the logistics would probably call for it to either be a max-level zone reachable by city-based portals or the addition of some sort of port settlements ("Hey, the Cataclysm caused a landslide in the west! New beach, everyone!"), since nobody has the patience for long flights any more and its placement cuts it off from the rest of the world too much to fit it dynamically into a normal leveling curve.