Hello Aspirant! What you think? Will man kind not need potable water to drink? Will man kind not need to dispose domestic as well as Industrial sewage? Will man kind not need electricity any more? We will not need roads, bridge, railways, airports and harbors for travel? Don't we need dams for irrigation or electricity purpose? What is the future of skyscrapers as land always remain same while population is ever increasing. Where these all people will live?

Come on, it is an immortal branch. It will exist and it has always good future until human kind will exist. Civil Engineering is the one of the ancient branch and fundamental need of human being so it has a bright future as its bright past.
It's just that the competition is increased and you need to work hard to come out as the best.
Hope this helps.