I think a Sea Herc would be another heritage, large, can do all, coldwar 4 hauler, like the Orion, Nimrod, Bear and Ill-38.
Its just not the route MPAs seem to be going. Smaller multirole platforms as part of complicated networks seem to have the future.
E.g. EADS added/ is adding inflight refuelling, AEW, anti ship missiles, guns, Mk46s, winglets to its C295 platform.
The maximum take off weight of the C295MPA is 23,200kg. More then 4 times as low as the MR4s (105k)..
Adversaries are not the same / at the same place they were in the Nimrod/ P3C era. IMO a Sea Herc provides an answer to a big requirement that isn't there anymore, just like the MR4. Neither are the budgets.
Search and Rescue (SAR) | c295
http://www.defenceweb.co.za/index.ph...812&Itemid=107