As noted in my reply, they already have.
NEW test day: Tuesday, January 26, 2021
https://collegereadiness.collegeboard.org/psat-nmsqt-psat-10/k12-educators/psat-nmsqt-dates
“ New January 26, 2021 PSAT/NMSQT administration
The January administration will have the same benefits as the October PSAT/NMSQT, including eligibility for programs administered by the National Merit Scholarship Corporation.
All flexible ordering and administering policies for fall testing are extended for the January test date: flexible start times, off-site testing, and testing students across multiple dates. Additionally, schools won’t be charged unused test fees.
We will send schools an email by mid-October when ordering for the January administration is open.”