Actor shortage?

It looks like we’ve hit the end-of-line in bit part actors on network television. Conrad Ecklie (played by Marc Vann) was recently on an episode of NCIS, Bradford Meade (from Ugly Betty, played by Alan Dale) was recently on an episode of Lost and Judd Nelson was just on CSI:NY (okay, maybe John Bender was a special guest). I mean, sure, people need to work, but there must be a jillion actors who can play the bit parts.