Obviously if you do not renew the green card itself, you are going to face practical issues, because you have no easy way to prove your permanent resident status. So things like employment verification because of new employment and entering the country from abroad will become quite a bit more difficult.
They're working on that. https://www.pbs.org/newshour/show/doj-deploys-tactic-to-stri...
Simply applying for renewal or naturalization extends the card as well.
There is no eventually about it. This administration has a quota for revoking naturalized citizens' status set hugely higher than the historical level of cases. Given the quota they will just ignore justice and revoke the status of those least able to defend themselves, like they have with other immigrants.