The upcoming patch for The Old Republic has an interesting twist on the standard dungeon or instance. The patch contains two new flashpoints (4-man instances). The Hard Mode version is the standard flashpoint, with a tank, a healer, and 2 dps.
However, the Story Mode version of the flashpoint will be designed for any group of four people, with no Trinity required.
I think this is a really clever idea. A easier version often has issues because no one runs it, preferring to run the harder version for better rewards. But the Trinity-less version offers extremely fast queue times, as all you need are four bodies.
This might set up an equilibrium, as some DPS move from the HM to the SM queue, decreasing times across the board.
As well, difficulty seems more appropriate. In my view, the Trinity is a stronger skeleton for combat, allowing you to make fights more intricate and involved. Hard Mode requiring a tank and healer, while Story Mode not requiring these, feels intuitive and right.
Finally, this makes very good use of the art assets, netting a 2-for-1. As I've said before, I think art asset creation is the blocker in modern video games. Any time you can reuse the same art for multiple types of content is a win.