The P3 turbo prop configuration is the most efficient airframe for the mission. It can be onsta within a few hours with it's cruise speed of nearly 400kts, but it can also loiter at very low airspeeds which is a requirement for surface interdiction and ASW. As far as I know the ASQ114 data package was replace years ago, and they did away with reel to reel before I got out in '91. The aircraft has been completely integrated since the late '60's. If the design aint broke, don't fix it. This could save quite a chunk of change in development costs.
"The P3 turbo prop configuration is the most efficient airframe for the mission."
It was good in its day, to be sure. But the high-bypass turbofans on the MMA match or better its loiter time. They also, due to their increased speed and lowered maintinence requirements, completely change the way you do business. With newer buoys and analysis systems now in the works, it's no longer required to spend all that time down low.
As well, the MMA eliminates about two crew members (the FE's), and its increased loadout of buoys and fuel means you can do a LOT more. Oh, it also has true inflight-refueling capability.
As I said in a previous post, it is thought that one MMA can replace three P-3's.