Theoretically, if PD is current for 12 consecutive months and you don't file I-485, the I-140 can be revoked under INA 203(g). However based on the limited information I've seen, USCIS usually does not enforce this rule, only the NVC does it (if the I-140 is with them). So it's unlikely that you'll lose your PD, unless the administration changes their stance on INA 203(g).