I realize a lot of the 4096 states are extremely unlikely (especially Up+Down or Left+Right ... not physically possible on an unmodified controller); but if the

I realize a lot of the 4096 states are extremely unlikely (especially Up+Down or Left+Right ... not physically possible on an unmodified controller); but if the inputs you predict end up wrong, then you have no choice but to run the frame again normally. This is going to cause an extreme jittering where the input lag doubles for some frames. Imagine audio stuttering from a scratched CD, or a framerate that suddenly dips from 60fps to 30fps for a moment and then resumes. With input, the effect is going to be even more jarring. If you're going to do this, you absolutely can't have a miss. Ever.