Abrupt changes often draw too much attention to themselves. If I say of a change I like, "Is it happening, or isn't it? I don't get it." then those that oppose the change may also be confused. And any real change is so much bigger than human opinions--it has its rhythm that may be more like star or mushrooms or some other not human thing. A change that is bigger than human opinions may take longer than human opinions think it ought to.