What would happen if you pull e-brake and floor the acceleration while driving at speed?

In a Youtube video, a man’s gas pedal gets stuck all the way down while driving on the highway at 100 mph. He claims he is unable to put the car in neutral, and refuses to pull the e-brake. He calls 911 and is eventually stopped by the police, who use spikes to blow out his tires.

I thought it was obvious that in this situation, you should slowly pull the e-break to at least slow you down. However, many people in the comments said this is a bad idea; they claim that at best, the e-brake would just break immediately and be ineffective, and at worst, something else could happen internally that makes you lose control of the car.

What is the worst case scenario of slowly pulling the e-brake while the gas pedal is stuck? Could anything go horribly wrong?