Getting the best gaming deals when available is always important and beneficial for the most extreme gamers. I can't really blame you asking considering I am a gamer myself who streams by a specific schedule.
It's basically a supply and demand issue from what I can tell. The 1070 is a fairly new graphics card and so I highly doubt this computer is just "not coming back into stock"
Sadly though it may be either way difficult to dictate as to when the product will return to stores/online. As bobberuchi suggested dutifully checking back on the status normally is the best bet.
From personal experience I have had mixed results where some products come back into stock and others never do.
_________________________________________________ I am not affiliated with Best Buy nor have I ever been employed by Best Buy. All of my thoughts and posts are of my own opinion and personal experience.
I may not always know the right answer, but I will always tell you what I do know. I also do free computer analysis and consultation via private message.