Golden Corral buffet or high quality dining...Which do you prefer?

[Zantetsuken]

With that system, though, it means we would be "condemned" to the current "1000000 mob spam-fest" for leveling, huh?

I hope that's not the case. Leveling is supposed to be the only "recurring" content we have available, even when expansions and all that are on the back burner. If it's stays fast, and continues to offer very little "stimulation," then the game's gonna get really boring.

The finished product will end up being the way it is now:

Play after the new content is released, beat it, cancel subscription; repeat cycle.

Not quite sure what you are saying here...

How does adding an alternative to the current spam-fest, end up condemning us to the current spam-fest?

Most people level in full parties, which means they will likely opt for the more strategic and longer battle xp option (esp if there is a slight xp bonus over chaining mobs in the same timeframe)