The problem with blimps is they're a platform in search of a mission. There's nothing they can do that's not already being done by other platforms. They might be able to do some things better, but with some significant drawbacks.
About every 20 years or so the Navy gets interested in blimps again; this time we actually got one flying with NAVY painted on the side before the low-interest light came on. We don't really have the budget these days for cool new toys. I find it interesting that the Army is the one pumping money into all the LTA programs now (they're paying for the MZ-3; VXS-1 was in the process of mothballing it).
Still...this beast is pretty damn cool-looking, and when's the last time anyone said that about a blimp?