And yeah, let's not ask stupid questions like, "how long before the first boss gets killed?". No one knows the answer to this question. Just no one knows what will be the boss system, how many of them will be, and how to defeat them.
Let's just wait:)
While you`re technically right, there`s nothing wrong with speculation and discussing.
I personally wonder about the reward from the bossfight. it should be greater than the amount of IMPs spent on fight commission, otherwise there will be no point to fight bosses.