seeking an englisg expression...

[jirikoo]

I am seeking an expression to imply this:

I am talking, for instance, with a coleague of mine and we have a little disputes over, lets say, procedures at work. We are looking for a compromise and he offer solution. I reply in shock: "Nothing can be worse than that!!! Its maximum you can be allowed to.
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The key expression is bold. How else can i utter that? Any idea?

Hope my question was intelligilible.

[Anglika]

You are presumably trying not to offend your colleague.

Let's look at the consequences of your method. There could be an even better way.