Definitely yes. If it's not already there. I mean.... every politican fears to use this word and they won't tell us wether or not there is one either. Everyone has to decide on his own when a war is a World War.
For example, many countries are directly or supportively already involved in the conflicts in the near east. The war takes place not only in one country, but in several. Many people of different cultures suffer from this war. What is a World War, if not this?