Change rapidly becomes personal. No matter how great an idea is for an organization as a whole, there are always going to be individuals who interpret implementation as a threat or as a waste of time. There are also going to be individuals who simply don’t ‘get it’ — at least at first.
You may want to just ignore them or wish them out of the way. But this is a critical target group to understand. They are customers for your idea. You need to understand their motivations and fears and develop elements that address their needs. In many cases their concerns might help you focus development of your idea in a way that more clearly identifies and defines the advantages that will make the sale.
It is dangerous to assume that those who don’t rapidly latch onto an idea are slow or simply wrong. Understanding their issues can smooth the way to your idea’s implementation.