Airships making a comeback?

Following this story:
http://www.telegraph.co.uk/news/uknews/defence/9079047/21st-century-airships-may-join-Navy-fleet.html

I’ve already read that these systems are being developed for US forces as a long endurance recon UAV, with the option to be manned if necessary.

Obviously these are only suitable for low or no threat environments, but is this technology worth pursuing?