I see two big problems with this statement:
1. It falls into the "everyone must be extraordinarily excellent" trap. The average employee is... average. Odds are your hiring practices are average too. It is better to focus on getting people's best than it is to focus on having the best people, because very few companies actually do have the best people. If you think your company is different, you had better have a compelling reason.
2. Even for good employees, it takes time for them to adapt to your company and perform at their best. Obviously you need to let some people go, but if you hold a noose over their heads from day one they're just going to worry about looking good for long enough to collect their options/bonuses/etc.. Looking good in the short-term and doing good in the long-term are often incompatible goals.