Nobody wanted to replace the Whirlwind with the S58/Wessex. Why? Because there was nothing wrong with them.
Nobody saw the need to change the S58/Wessex for the S61/Sea King for similar reasons.
However, if we tried to do what we do today in the Whirlwind, we wouldn't last 5 minutes.
Guys, if you want to live in the past can I suggest that you ask for Weston Super Mare as your next assignments. The rest of us can then get on with taking SAR forward.