Yungerman from Lakewood is 100% correct. Say the levaya had been pushed off until today, would all the yeshivos in Israel have closed yesterday? No. The reason they closed was to attend the levaya. Being that no one in Lakewood (or anywhere out of Israel, for that matter) was physically able to attend the levaya, it would have been pointless for them to close yeshiva on the day of the levaya.
Obviously there will be hespedim in Lakewood after the fact, as there were by R’ Elyashiv.