Gen2 is not expecting to mine significantly before December! That's not "on the horizon"!
I thought it was Nov, but even then, why would you add more of Gen1 to the mining farm, right now when you can sell it for a profit immediately?
Exactly, if you can sell H/W immediately for more BTC than you can mine with it in forever, of course he should sell it.
Except that by selling you increase the hash rate that is outside your hands and make it harder for you to mine in the future.
Not sure if it has a noticeable effect, though, given the crazy exponential increase anyway.