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Could fans become a standard safety feature of all cars? It could activate only when needed, when the driver needs to swerve suddenly or when the tires begin to lose traction due to ice/oil/hydroplaning. Hazard detection systems could activate the fan early.

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Unlikely, "fan cars" are really "vacuum cars" and that vacuum needs to occur under the car, so the car needs to have a low ride height which most cars are don't have and can't have.

The fan can't be activated that quick in order to create vacuum so it would need to be running most of the time, also can you imagine having hundreds of cars rolling down the street with their fans on blasting whatever gunk, dirt, gravel into the air?

Why do you think a car could not create a vacuum quickly? Airbags deploy quickly. Seatbelts tighten quickly. An emergency vacuum could use three parts: a deployable skirt, a device to create the initial low-pressure, and a fan to maintain it. The speed limitation is the speed of sound (340m/s), which takes only 1 millisecond to propagate through 1m of distance from the car to the ground.

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