Wow it would appear that the police procedural/courtroom drama series are still happening but the spy & assassin type shows are really picking up as the next wave of popuarity.
Covert Affairs (Piper Perabo, new USA series
James Cameron 'True Lies' TV series in development
ABC making "Charlie's Angels" reboot
Chaos for Fox.
CW is making a pilot for remake of "La Femme Nikita"
ABC Family channels' "Shadows"
Legends
also just today it was mentioned a new CBS spy drama from Anthony Zuicker
Treadstone -
Why has this genre come back?Treadstone, which centers on the workings of the Robert Ludlum-created fictional division of the CIA and chronicles how real spies live and operate in today’s world. "We are fascinated by the concept of the citizen spy who lives among us every day," Zuiker said.
Sure Alias was a good show the first 2 or 3 seasons ending in 2006 which was only 4 years ago.
Was there one show that started it off again in the last year or so, the spy more than the assassin element?
Really the spy genre has been going since the early 2000's. You had the BBC show "Spooks" which ran from 2002-2011
Also
La Femme Nikita, 1997-2001
The Agency, 2001-2003
Alias, 2001-2006
24, 2001-2010