While some answers suggest that you could play the "Signing this mail won't make a difference"-argument I am afraid this might get you into a bigger discussion.

I am with you on the point that it suits you quite well and would build my argument on that exact point, that you are confident or convinced of. Fact is that some people, including you, are in a position others may envy them of; it is completely reasonable to not disagree on your fortune and not wanting to push for a decision that might have a disadvantage on your position - and it is not given that a) something will change anyway and b) the change favours more people or is considered more fair. There is no solution that suits everybody in this scenario I am afraid, so no solution will be fair for everybody.

Personal note: Please be aware of that your colleagues may at some point even project their frustration at you. So maybe don't put to much effort into keeping friends who maybe aren't your friends.

While some answers suggest that you could play the "Signing this mail won't make a difference"-argument I am afraid this might get you into a bigger discussion.

I am with you on the point that it suits you quite well and would build my argument on that exact point, that you are confident or convinced of. Fact is that some people, including you, are in a position others may envy them of; it is completely reasonable to not disagree on your fortune and not wanting to push for a decision that might have a disadvantage on your position - and it is not given that

1. something will change anyway
2. the change favours more people or is considered more fair.

There is no solution that suits everybody in this scenario I am afraid, so no solution will be fair for everybody.

Personal note: Please be aware of that your colleagues may at some point even project their frustration at you. So maybe don't put to much effort into keeping friends who maybe aren't your friends.