If we use the S&P 500 as a proxy for the top 500 companies, I would guess that a lot more than 0% will be gone by the end of 5 years.

It's hard to find non-paywalled sources for business analysis, but from what I can find it'd be about 20%.

4.4% turn over per year, 22% in 5 years apparenty

https://www.exchangecapital.com/blog/why-the-sp-500-isnt-wha...

and accelerating apparently

https://blog.irvingwb.com/blog/2020/01/the-pace-of-creative-...