Cometh the halvening, and lo! ... all them Chinese chicken coops full'a insta-obsoleted SHA-256 gear

Gonna be glorious!
https://s32.postimg.org/ag0hs94p1/opt.jpg>99.9% attack for a fraction of a years in order to increase the block period by 100X for a period of years.
(all the GPUs currently mining a coin) * 999?