Heroic Teq??
Eh, a world spawn? No thanks.
If it were a raid instance then hell yeah.
2x 80 Necro, 80 Ranger, 80 Thief
The last thing I would want is to have copies of various encounters at a half-dozen difficulty levels with only slight twists. Absolutely no, that is such a lame excuse for not simply providing more content.
There are already a couple of other games pursuing this “hard mode” strategy, maybe you’ve heard of them. I’m not really interested in copying them, especially since that would undoubtedly lead to massive instancing and turning the game from a world into a lobby-based game where you really only need LA and port to your instances, never interacting outside of your guild, etc. Pass on that.