Are your city's city limits "frozen"?

Are your city's city limits "frozen"....that is, set for eternity? Your first reaction may be "YES!", but keep in mind the following: there were a lot of changes in city limits in the past; who is to say there won't be others in the future? So I'll take you to the future. Let's make it 2050, mid-century, and ask you the following: In 2050, will your city's city limits be exactly in the place they are today? Now that means they can be larger through annexation and smaller by secession. So no matter how old your city is or in what part of the nation it is in, will its city limits change at all in the next 45 years? What do you see will be your city's city limits in 2050?>