They are not replacing the P-3 Orion with a UAV. Wherever you got that information is very misinformed. The P-3 Orion is being replaced by the 737 MMA (Multi Maritime Aircraft).
I am currently stationed at NAS Brunswick, and while on the record I have no comment, off the record, I wouldn't read too much into this. I don't think this base is going anywhere.
Acccording to the lastest budget the 737 MMA project is on the block and likely to be cancelled/cutback.
http://www.aviationnow.com/avnow/news/channel_awst_story.jsp?id=news/01035wna.xml
"Items facing the chopping block include up to 175 of USAF's F/A-22s, the Navy's Multi-Mission Maritime Aircraft (MMA) replacement for the P-3 and DD-X (which would have begun introducing directed energy weapons), as well as a cut of as much as $1 billion from the Marine Corps' V-22 program."
Just read where Lockheed is delivering some more upgraded planes to you folks. My daughter and son-in-law work on the P-3's there. My daughter just hates winter with a passion.