The protective layer on Wen Yu's soul was formed as a result of the Jasmine Lily's ability Life Protecting Soul.
Although the Wailing Snake's final attack on Wen Yu would not cost Wen Yu her life and any injuries her soul sustained could be healed by Ji Feng and sped up if the Cold Snow Pine resin was used, it would take around two months for the healing to be completed.
During the two months, there was no way that the Astronomical Parliament's parliamentary meeting could be held. This would put a huge dent in Lin Yuan's plans.
Lin Yuan could see Ta Lei and Su Yiren anytime because they were in the Divine Wood Federation. Yin Lin was still in the Radiance Federation, so Lin Yuan could explain the situation to her.
But he would lose communication with Bei Xu, Bu Po, and Wo Lun. It would be a devastating blow to all three of them if they could not enter the Astronomical Parliament.