I'm pretty sure there's already FCC rules requiring deorbit of satellites within a certain number of years of their mission completion.

[Edit] https://www.fcc.gov/document/fcc-adopts-new-5-year-rule-deor...

It's in LEO, the atmosphere will bring it down.

Yep. Part of launching is making a deorbit plan (if possible). That satellite will come down, and they already know when that will happen.

when a big publicity incident caused by space junk happens