It won't be 5 years, it'll be less than a year. When you don't exercise, your muscles atrophy. It's the same for any other skill. I use to speak conversational french in college, fast forward 10 years later and my understanding is no different than a casual "Emily in Paris" fan.

It'll be the same here, the only question is if those that do exercise will be able to command better salaries. I think this is possible but not with the current political climate.