It's only WADA's decision. IOC and FIVB can reject the suggestion. ICO rejected WADA and let Russia to be in Rio 2016. FIFA also let Russia to hold World Cup 2018.
Just wait and see!
IOC did not "reject" WADA. They left the decision to each international federation. And basically only the athletics federation banned Russia.
FIVB in particular is very pro Russia, so I doubt they will ban their teams if it's up to them.