Yeah, i think it just means that the consequences of change can be both good and bad - they can have positive effects for some, and negative effects for others...
I know this may sound backwards... but maybe the statement
there is no change for the better that is not at the same time a change for the worse.
means that change is what you make it... it can be for the better or for the worse.. depending how you deal with the change. Which is kinda the same as what you said.. but i don't think that change is positive or neagtive.. i think its our response to the change that determines whether it is positive or negative..... if that makes sense... sorry if i confused you more