Why don't we revive old raids such as Ulduar, Naxxramas, or even older favourites, with improved stat on loot and harder difficulty? *
Seeing as original wow always renewed with new expansions after given time, the forever 3.3.5 server should use older and frankly better instances to their advantage. The entire WOW has shrunken into the same ICC instance and guilds are getting tired of the same instances over and over again.
More gear variety at endgame would also be a huge bonus for variety and colour, as well as a bonus profit for server staff as more rare items would be sold as Bis items on the store. You could for example add another legendary weapon from the old world (Maybe to cover each class) to sit beside Shadowmourne. This could potentially also balance the PvP aspect.
**You could also do the same thing with random dungeon finder, by adding older dungeons into the mix and removing the least liked.
** Maybe do a poll and see if this is what people wants? Personally I think it would be a huge server boost in every aspect. More people would be drawn to play on Warmane long term and more veteran players would return from their boredom.
Making old content drop usable gear means people will be forced to run old content. Some (most?) people will not be okay with being forced to do Ulduar, for instance.