Just as we're thinking about how to reproduce an MRA4-type capability with the P-8, here comes the CSBA's house bubblehead to complicate the issue:
http://csbaonline.org/publications/2...ersea-warfare/
Clark sees less and less utility for passive acoustics. MAC (P-8A Increment 2/MRA4) is OK, but limited in range, and over-reliant on cueing by passive systems. The way to go in his view is medium- and low-frequency active, and using new technology to exploit known but previously impractical approaches such as Kelvin wakes on the surface.
He's also down on P-8A (relative to the USN which sees it as the mainstay of ASW) because it can't operate in contested airspace. (By the way, others take the view that the entire purpose of the Chengdu J-20 is to expand said contested airspace and take out HVAAs and tankers.)
He's up on UUVs using LFAS.