Everybody is leaving in my team!!

I am faced with challenges nowadays, my colleagues at work are moving on to better ventures in life.Getting engaged /better offer,in a team of 3 which handles asian operations ,Iam the only one left .
In an environment where people leave at the same pace as they join ingreat number,we have been hanging around for quite sometime in the organization.Should i also back out!!!godddd ,because the task we were upto is almost over and now that my colleague is leaving ,I`ll have to be fitted into a new role.The way my superior will look at me concerns me most now?.Whatever happens Iam telling myself to be gutzy and positive.