Can Joe Root break Sachin Tendulkar's Test records?

Joe Root surpassed Alastair Cook to become England's leading Test run-scorer, now only trailing Rahul Dravid, Jacques Kallis, Ricky Ponting and Sachin Tendulkar in the overall list. With form and fixtures favouring him, Root could potentially close in on Master Blaster's record - but by when? We do the math.