The P-8 taking off:
JetPhotos.Net Photo » N541BA (CN: 34394) United States - US Navy (USN) Boeing P-8A Poseidon by Jeremy Lindgren
I'd suggest that the Navy buy fewer than 122 P-8's and more Global Hawks and other UAV's.
Don't see any technological barrier to equipping a UAV to dispense and "listen" to sonobuoys.