The next obvious question is "whose signature is worth more than €5k a month (until the Smartcard is updated and the old sig is revoked)?"
And there's currently no publicly announced plan/date for revoking the affected certs. There's a tool coming out in November that you can use to generate new certs for your own ID card but as it's not compulsory, don't expect 100% of affected people to update in a matter of days, weeks or months.