I can see where Stamina can be viewed as a tactical element, but its potential is somewhat limited to party-play (in solo-play it just becomes a bore/"grind gate"). For instance, it can be good when you need to conserve Stamina to quickly kill a mob or use a set of abilities required for a specific scenario.

Personally I think they can do alot better. The system is very basic, can easily become a meaningless frustration on longer fights, and really doesn't have accompanying in-game encounters that truly capitalize on it.

Ultimately, I hope they substitute it for a system that is more geared towards group-coordination of abilities to tackle difficult fight mechanics (in addition to adding more depth to class abilities and ability rotations). I personally think that this route contains more possibilities, as well as provides a small goal/challenge for players to achieve without authentic frustration.