Unless you have evidence, it is presumptuous to say they can't prop up a simple message board.  It is far more likely that Q-team has opted for an abundance of caution so that 8chan will not be hacked, bugged, phished, excessively trolled, further infiltrated, or otherwise subverted in the days leading up to official sworn statements. Shutting it down is simply good risk-management. (I do not expect it to pop back on the 6th either.)