Few people would argue that we don't need an LRMP ASW/ ASuW capability I suspect so if the RN are prepared to give something els up in order to provide it then why not?
Nimrod MRA4 has gone but the requirement has not. Money is in short supply but if a system can bought by giving up the funds currently allocated to other, presumably lower priority, programmes then so be it. I think the RN has a fair few Observers and Aircrewman around whose core competence is in ASW/ASuW.
So which platform is to be (and which lower priority programmes are to be cut)? Taking a leaf out of the RAF book, the RN could buy/ lease some old P3 or S3 & refurbish them, much as the RAF are doing with Rivet Joint vice Nimrod R1.