Fantastic article covering the need for modern defenses to change in order to cope with the read-option.
So, ultimately, how do you stop the read option?
Cover Corners and Speedy Safeties
Because there is a numerical advantage given to the offense in how things run, the most likely solution involves dropping an additional safety into the box. As seen above, keeping four defenders back (two safeties/two corners) can create problems in the run game as your front-seven gets beat. Bringing one of those safeties into the box neutralizes the numbers game somewhat but here's the rub:
Your cornerbacks better be strong in press and man-to-man, and your deep safety better have range to cover the deep-middle of the field.
Sounds like we're set for a while.