There are no absolute guarantees in life, including the reliability of a Toyota with 36001 to 100,000 miles on it. However, is the purchase so risky that its necessary to spend 1700 for the peace of mind? It would not be to me, but everyone is different in their level of risk-aversion. Extended warranties are high profit items for the people pushing them. That's enough to know that they are a poor value, on average, especially for a car/model known for its reliability. How many people do you know who have spent over 1700 on repairs of the type covered by this warranty on a Camry?
Why decide now? See how reliable the car is and decide right before the basic 36K warranty expires. There's a lot that can happen between now & then - like a wreck, theft, change of vehicle plans, etc. You have 3 years or 36K miles to make this decision and to comparison shop for price if you decide you want it.