Benefits and work packages have always been the cause of debates and jealousy. Why would you change anything if you have so much to loose? It's often worth it to hold on to your job even though it's not perfect.
Yet one day you'll put things in perspective and realise there's more to it than just what you have. Economics might put pressure on your job or you may just want to learn something new.
Changing means taking the risk to loose what you've earned the hard way. But it's also a new start, an opportunity to make things better and be happier.
Things always change after a while, ignoring it means you're likely to hit the wall right in your face. Going with it and learning from experience means hard work and big rewards.