Unless the entire DMV system is revamped, this would friggin collapse entire cities. On any given day, there would be 500,000 people visiting the DMV for road tests. Mucho badness.
Statistically speaking, I don't agree with this. There are roughly 190 million registered drivers. 50 states and D.C. 250 business days in a year. That's only about ~15,000 drivers a day, per state. Doesn't seem unreasonable to me.